Screenshots: enforce a 940 width

This set the size of the screenshot dialog to 940x540
and scales down the image
Fixes #17
3 jobs for bilelmoussaoui/screenshot-size in 1 minute and 58 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #515069
flatpak

00:01:34

 
  Deploy
passed #515070
review

00:00:24

manual #515071
allowed to fail manual
stop_review