Add shortcut for shortcuts window

Follow https://gitlab.gnome.org/GNOME/Initiatives/-/issues/14
3 jobs for master in 2 minutes and 57 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #17075
run-appdata

00:00:04

passed #17074
run-tests

00:02:44

 
  Build
passed #17076
run-build

00:00:09