data: Add X-GNOME-Shell-Utilities.directory file to allow showing real name
Instead of having the name of the directory be X-GNOME-Utilities. This
also allows translating the name to the user's language. The name is
chose to be different to X-GNOME-Utilities from GNOME Menus.
In the process, also remove the categories. The menu definition from
gnome-menus is not used, and it's not a category that apps list
themselves, so it's completely unused anyway.