Simplify brightness toggle

fixes http://bugs.aokp.co/issues/26

Change-Id: I51a0cdd2604158094cc027e735a6b176deb6d575
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/toggles/BrightnessToggle.java