main/postmarketos-hidden-desktop-entries: unhide Glade

Glade can be useful if you're building GTK apps on your phone when making use of convergence, so let's unhide it. The reason it was hidden was that it gets pulled in when building Phosh, but this might be solvable in a better way.

Hiding of org.gnome.Extensions can probably be dropped when https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/31086 has been merged.