Fixed the iTaks environment files generation

There was a tiny bug with the build scripts for clean-bundle-itasks. The portion of the script that is responsible for merging the environment files into one was always cutting the first three lines of each environment file, removing the "Environment" line, which is responsible for marking the declaration of a new environment. This caused the clean-bundle-istasks to have only one environment declared and many "EnvironmentName" dictionary entries, which caused unwanted behavior.

On clean-bundle-complete, the build scripts strips only 2 lines and as a consequence, the bug isn't present on that package.

The fix just replaces "tail -n +3" by "tail -n +2" in the build scripts for both windows, linux and macos.