printers: Move callbacks into .ui file

11 jobs from printers-options-dialog-gtktemplate in 6 minutes and 15 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #214907
build

00:02:53

 
  Test
passed #214909
asan

00:03:21

passed #214908
test

00:02:56

 
  Manual
manual #214914
allowed to fail manual
armv8
manual #214910
allowed to fail manual
flatpak
manual #214913
allowed to fail manual
msan
manual #214915
allowed to fail manual
ppc64le
manual #214911
allowed to fail manual
tsan
manual #214912
allowed to fail manual
ubsan
 
  Review
manual #214916
allowed to fail manual
review
manual #214917
allowed to fail manual
stop_review