xwayland: Add some more xwayland fake modes

Adds the following 16:10 modes primarily for scaling up on Steam Deck:
 - 1152x720
 - 960x600
 - 928x580
 - 800x500
 - 768x480

Signed-off-by: Joshua Ashton <joshua@froggi.es>
Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
4 jobs for extra-modes in 3 minutes and 53 seconds (queued for 1 second)