desktop: Hash uids for desktop games
Instead of using application id directly, use its sha256 checksum.
Implements this comment: https://bugzilla.gnome.org/show_bug.cgi?id=769350#c13
Instead of using application id directly, use its sha256 checksum.
Implements this comment: https://bugzilla.gnome.org/show_bug.cgi?id=769350#c13