Update menus for AppMenu removal

Resolve GNOME/gitg#141 by always using
the fallback in-window menu and removing the 'Quit' item
5 jobs for master in 11 minutes and 54 seconds (queued for 42 seconds)
latest
Status Job ID Name Coverage
  Test
passed #137826
flatpak

00:11:02

 
  Review
passed #137827
review

00:00:23

manual #137828
allowed to fail manual
stop_review
 
  Deploy
passed #137829
pages

00:00:28

passed pages:deploy

00:00:00