media_viewer: Remove zoom controls

Until we get a proper image viewer widget, we've
decided that it's best to remove the zoom controls
instead of having broken ones.
4 jobs for <span class="ref-name">wip/christopherdavis/redesign-image-viewer</span> in 24 minutes and 26 seconds (queued for 1 second)
Status Job ID Name Coverage
  Check
passed #238191
check

00:00:22

 
  Test
passed #238192
flatpak

00:23:36

 
  Review
passed #238193
review

00:00:27

manual #238194
allowed to fail manual
stop_review