SystemUI: fix double tap to sleep not working with secure lock screen

Double tap to sleep on status bar would only work on secure lockscreens if the
slider brightness control was enabled.

Change-Id: I7c4dc5b2f559aafae819422d747f92ac59631ffd
Signed-off-by: Roman Birg <roman@cyngn.com>
(cherry picked from commit c7a4aa92)