compositor-drm: run finish_frame when dpms is turned off in update_complete

A output repaint loop isn't scheduled beacuse the output repaint_status
is AWAITING_COMPLETION when dmps is turned off in update_complete().
Therefore, the display attached to the output is remain inactive even if
weston wakes up. By going through finish_frame, the output
repaint_status is fixed to correct status.

Signed-off-by: Tomohito Esaki <etom@igel.co.jp>
2 jobs for drm-backend-fix-dpms-off in 1 minute (queued for 33 minutes and 34 seconds)
Status Job ID Name Coverage
  Container Prep
passed #357047
container_prep

00:00:24

 
  Build
passed #357048
build-native-meson

00:00:36