online-accounts: Set label relationship for listboxes

Set the label relationships so that screen readers
read the headers for the listboxes.
11 jobs for online-accounts-a11y in 5 minutes and 5 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build
passed build #184985

00:02:13

 
  Test
passed asan #184987

00:02:51

passed test #184986

00:00:44

 
  Manual
manual armv8 #184992
allowed to fail manual
manual flatpak #184988
allowed to fail manual
manual msan #184991
allowed to fail manual
manual ppc64le #184993
allowed to fail manual
manual tsan #184989
allowed to fail manual
manual ubsan #184990
allowed to fail manual
 
  Review
manual review #184994
allowed to fail manual
manual stop_review #184995
allowed to fail manual