ui: Draw highlighted parts separately in GamepadView

For some reason, drawing them all in one group results in all parts but
the first one being misplaced. Hence draw each one in a separate group.
6 jobs for wip/exalm/gamepad-drawing in 25 minutes and 5 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #103935
flatpak:app

00:16:51

 
  Test
passed #103936
flatpak:tests

00:04:22

 
  Review
passed #103937
review

00:00:27

passed #103938
manual
stop_review

00:00:19

 
  Cross Distro
passed #103939
fedora:29

00:03:04

passed #103940
ubuntu:devel

00:02:44