SystemUI: Fix screenshot animation not showing the picture properly

When taking the screenshot,the drop-in animation looks completely like a mess.
This patch fixes the problem and now the taken picture should be displayed
properly.

Change-Id: Iddb72e58a236d6a96048608ee140ce262053d5d2
Merge "SystemUI: Fix screenshot animation not showing the picture properly" into android-4.4
Merge remote-tracking branch 'cm/android-4.4' into android-4.4