Lockscreen: fix GlowPad overlapping the lower switches

Also added a check to allow disappearing options only in portrait

Change-Id: Ib30af4eed591d6835ba6ba46cd90509958a50d1e
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>

Conflicts:
	res/layout-sw600dp/lockscreen_targets.xml
	res/layout/lockscreen_targets.xml
	src/com/android/settings/carbon/Lockscreens.java