desktop-shell: Put monitor to sleep when idle timer expires

Removing the screensaver had the accidental side effect of disabling
DPMS display shut down.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
1 file changed