lookingGlass: Center-align chevron

We currently assume that label and entry have roughly the same height.
This is no longer the case after we increased the minimum height of all
entries, so make sure the label aligns properly.

GNOME/gnome-shell!701
6 jobs for !701 with Entry_fine_tune in 4 minutes and 7 seconds (queued for 1 second)
latest detached
Status Job ID Name Coverage
  Review
passed #421743
check_commit_log

00:00:22

passed #421745
eslint

00:00:51

passed #421744
js_check

00:00:52

 
  Build
passed #421746
build

00:02:29

 
  Test
passed #421747
test

00:00:43

passed #421748
test-pot

00:00:45