Settings: Fix Notification Drawer icons.

Change-Id: I5fe6fcf23a97f7449aa964d5cf796018dd11abb5

Conflicts:
	res/drawable-hdpi/ic_notify_open_normal.png
	res/drawable-mdpi/ic_notify_open_normal.png
	res/drawable-xhdpi/ic_notify_open_normal.png
	res/drawable-xxhdpi/ic_notify_open_normal.png