Fix registration options to not be required

website/registrations/templates/registrations/register_member.html

@@ -47,7 +47,7 @@
             <div class="control-group row">
                 <div class="controls">
                     <label class="checkbox">
-                        <input type="checkbox" name="optin_birthday" required id="id_optin_birthday">
+                        <input type="checkbox" name="optin_birthday" id="id_optin_birthday">
                         {% trans "Display birthday in calendar" %}.
                     </label>
                 </div>
@@ -56,7 +56,7 @@
             <div class="control-group row">
                 <div class="controls">
                     <label class="checkbox">
-                        <input type="checkbox" name="optin_mailinglist" required id="id_optin_mailinglist">
+                        <input type="checkbox" name="optin_mailinglist" id="id_optin_mailinglist">
                         {% trans "Receive emails about (amongst others) job opportunities and in-house days from sponsors of Thalia." %}.
                     </label>
                 </div>