Remove monochrome versions of help-related app icons
App icons should always be colorful at all sizes. the help-browser and system-help icons are in the Applications group, and currently violate this by displaying monochrome versions at their 16px and 22px sizes. For consistency, they should be removed.
The help-contents action icon currently uses symlinks to those icons for its 16px and 22px monochrome versions (which are appropriate since it's an action icon), so to avoid breaking it, those sizes are transformed into files rather than being symlinks.
BUG: 456737 FIXED-IN: 5.97