use NC default background color for Mail favicons

img/favicon-notification.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 595.275 311.111" xml:space="preserve" height="32" width="32" version="1.1" y="0px" x="0px" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" viewBox="0 0 32 31.999997"><rect rx="5" ry="5" height="32" width="32" y="-.0000052588" x="0" fill="#1d2d44"/><path d="m3.5556 7.4999c-0.8618 0-1.5556 0.6944-1.5556 1.5561v14.39c0 0.86188 0.69378 1.554 1.5556 1.554h24.888c0.862 0 1.556-0.692 1.556-1.554v-14.39c0-0.8621-0.694-1.5565-1.556-1.5565zm1.3125 1.7992 10.646 10.646h0.92366l10.694-10.646 1.0694 1.0694-6.3681 6.4653 4.8125 4.9097-1.0694 1.0694-4.9097-4.9097-3.5487 3.5972h-2.235l-3.548-3.596-4.9101 4.958-1.0695-1.119 4.8616-4.909-6.4171-6.4653z" fill="#fff"/><path fill="#ff4402" d="m30 7.0002a5 5 0 0 1 -10 0 5 5 0 1 1 10 0z"/></svg>
+<svg width="32" height="32" enable-background="new 0 0 595.275 311.111" version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 31.999997" xml:space="preserve" x="0px" y="0px"><rect width="32" height="32" x="0" rx="5" y="-.0000052588" fill="#0082c9" ry="5"/><path fill="#fff" d="m3.5556 7.4999c-0.8618 0-1.5556 0.6944-1.5556 1.5561v14.39c0 0.86188 0.69378 1.554 1.5556 1.554h24.888c0.862 0 1.556-0.692 1.556-1.554v-14.39c0-0.8621-0.694-1.5565-1.556-1.5565zm1.3125 1.7992 10.646 10.646h0.92366l10.694-10.646 1.0694 1.0694-6.3681 6.4653 4.8125 4.9097-1.0694 1.0694-4.9097-4.9097-3.5487 3.5972h-2.235l-3.548-3.596-4.9101 4.958-1.0695-1.119 4.8616-4.909-6.4171-6.4653z"/><path fill="#f00002" d="m30 7.0002a5 5 0 0 1 -10 0 5 5 0 1 1 10 0z"/></svg>

img/favicon-touch-notification.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 595.275 311.111" xml:space="preserve" height="128" width="128" version="1.1" y="0px" x="0px" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" viewBox="0 0 128 127.99999"><rect rx="20" ry="20" height="128" width="128" y="-.0000015" x="0" fill="#1d2d44"/><path d="m14.222 29.999c-3.4472 0-6.2223 2.7773-6.2223 6.2244v57.561c0 3.4475 2.7751 6.216 6.2223 6.216h99.555c3.4475 0 6.223-2.7685 6.223-6.216v-57.56c0-3.4472-2.7755-6.2244-6.223-6.2244zm5.25 7.1967 42.585 42.585h3.6946l42.777-42.585 4.2778 4.2777-25.472 25.861 19.25 19.639-4.2777 4.2777-19.639-19.639-14.195 14.389h-8.9446l-14.193-14.385-19.64 19.831-4.2781-4.473 19.445-19.639-25.667-25.86z" fill="#fff"/><path fill="#ff4402" d="m120 28.006a20 20 0 0 1 -40 0 20 20 0 1 1 40 0z"/></svg>
+<svg y="0px" x="0px" version="1.1" width="128" xmlns="http://www.w3.org/2000/svg" height="128" enable-background="new 0 0 595.275 311.111" viewBox="0 0 128 127.99999" xml:space="preserve"><rect y="-.0000015" x="0" fill="#0082c9" width="128" height="128" rx="20" ry="20"/><path d="m14.222 29.999c-3.4472 0-6.2223 2.7773-6.2223 6.2244v57.561c0 3.4475 2.7751 6.216 6.2223 6.216h99.555c3.4475 0 6.223-2.7685 6.223-6.216v-57.56c0-3.4472-2.7755-6.2244-6.223-6.2244zm5.25 7.1967 42.585 42.585h3.6946l42.777-42.585 4.2778 4.2777-25.472 25.861 19.25 19.639-4.2777 4.2777-19.639-19.639-14.195 14.389h-8.9446l-14.193-14.385-19.64 19.831-4.2781-4.473 19.445-19.639-25.667-25.86z" fill="#fff"/><path d="m120 28.006a20 20 0 0 1 -40 0 20 20 0 1 1 40 0z" fill="#ff4402"/></svg>

img/favicon-touch.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" xml:space="preserve" height="128" viewBox="0 0 128 127.99999" width="128" version="1.1" y="0px" x="0px" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" enable-background="new 0 0 595.275 311.111"><rect rx="20" ry="20" height="128" width="128" y="-.0000015" x="0" fill="#1d2d44"/><path fill="#fff" d="m14.222 29.999c-3.4472 0-6.2223 2.7773-6.2223 6.2244v57.561c0 3.4475 2.7751 6.216 6.2223 6.216h99.555c3.4475 0 6.223-2.7685 6.223-6.216v-57.56c0-3.4472-2.7755-6.2244-6.223-6.2244zm5.25 7.1967 42.585 42.585h3.6946l42.777-42.585 4.2778 4.2777-25.472 25.861 19.25 19.639-4.2777 4.2777-19.639-19.639-14.195 14.389h-8.9446l-14.193-14.385-19.64 19.831-4.2781-4.473 19.445-19.639-25.667-25.86z"/></svg>
+<svg height="128" version="1.1" enable-background="new 0 0 595.275 311.111" xml:space="preserve" viewBox="0 0 128 127.99999" width="128" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px"><rect height="128" fill="#0082c9" rx="20" ry="20" width="128" x="0" y="-.0000015"/><path fill="#fff" d="m14.222 29.999c-3.4472 0-6.2223 2.7773-6.2223 6.2244v57.561c0 3.4475 2.7751 6.216 6.2223 6.216h99.555c3.4475 0 6.223-2.7685 6.223-6.216v-57.56c0-3.4472-2.7755-6.2244-6.223-6.2244zm5.25 7.1967 42.585 42.585h3.6946l42.777-42.585 4.2778 4.2777-25.472 25.861 19.25 19.639-4.2777 4.2777-19.639-19.639-14.195 14.389h-8.9446l-14.193-14.385-19.64 19.831-4.2781-4.473 19.445-19.639-25.667-25.86z"/></svg>

img/favicon.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" xml:space="preserve" height="32" viewBox="0 0 32 31.999997" width="32" version="1.1" y="0px" x="0px" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" enable-background="new 0 0 595.275 311.111"><rect rx="5" ry="5" height="32" width="32" y="-.0000052588" x="0" fill="#1d2d44"/><path fill="#fff" d="m3.5556 7.4999c-0.8618 0-1.5556 0.6944-1.5556 1.5561v14.39c0 0.86188 0.69378 1.554 1.5556 1.554h24.888c0.862 0 1.556-0.692 1.556-1.554v-14.39c0-0.8621-0.694-1.5565-1.556-1.5565zm1.3125 1.7992 10.646 10.646h0.92366l10.694-10.646 1.0694 1.0694-6.3681 6.4653 4.8125 4.9097-1.0694 1.0694-4.9097-4.9097-3.5487 3.5972h-2.235l-3.548-3.596-4.9101 4.958-1.0695-1.119 4.8616-4.909-6.4171-6.4653z"/></svg>
+<svg xml:space="preserve" x="0px" viewBox="0 0 32 31.999997" width="32" xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 595.275 311.111" version="1.1" height="32" y="0px"><rect fill="#0082c9" ry="5" x="0" width="32" rx="5" height="32" y="-.0000052588"/><path fill="#fff" d="m3.5556 7.4999c-0.8618 0-1.5556 0.6944-1.5556 1.5561v14.39c0 0.86188 0.69378 1.554 1.5556 1.554h24.888c0.862 0 1.556-0.692 1.556-1.554v-14.39c0-0.8621-0.694-1.5565-1.556-1.5565zm1.3125 1.7992 10.646 10.646h0.92366l10.694-10.646 1.0694 1.0694-6.3681 6.4653 4.8125 4.9097-1.0694 1.0694-4.9097-4.9097-3.5487 3.5972h-2.235l-3.548-3.596-4.9101 4.958-1.0695-1.119 4.8616-4.909-6.4171-6.4653z"/></svg>