gs-folders: Update .desktop category lists from gnome-menus
Update the .desktop filenames from gnome-menus for the Sundry & Utilities categories.
Add a comment to explain the source of these lists.
Closes: #322 (closed)
Other Info
My test case was looking if Evince or Tweaks had Categories in the Installed list.
I tried building gnome-software with this change, but the test case didn't succeed. Maybe something is cached somewhere?
I am using Ubuntu 18.10.