Ignore Xss idle monitor on wayland

Wayland doesn't provide XScreenSaver Extension.
3 jobs for idle in 4 minutes and 7 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #20297
run-appdata

00:00:11

passed #20296
run-tests

00:03:42

 
  Build
passed #20298
run-build

00:00:13