Last App Toggle [2/2]

Signed-off-by: Zaphod <mwilson@acesappraisal.com>

Change-Id: I7199c941f63ff83c22f30ff833aa36739b21e749

Conflicts:
	packages/SystemUI/res/values/strings.xml
	packages/SystemUI/src/com/android/systemui/slim/SlimTarget.java