Frameworks: fix the random fc on pinch

Well logic error from me which can lead in an recycle bitmap fc due of a race
condition. Reason is simple it the animation needs for whatever reason longer then
the removing the tasks the view is probably still visible and recycle of the bitmap
results in a fc.

To fix it just remove the tasks after the animation is done and we definitly know
that no items are visble which are recycled.

Change-Id: I7878e02e6fb1887f8d11304550e083d107095a4a

Conflicts:
	packages/SystemUI/src/com/android/systemui/slimrecent/RecentPanelView.java