Using activity animations on non-fullscreen activities that sit over a wallpaper activity cause the exiting activity to show up underneath the next activity. If the next activity happens to be a wallpaper activity then this will be janky as the exiting activity will go from on top of the incoming activity to on top of the wallpaper as it animates away. Fixes bug 11200253. Change-Id: I7e81c50cfe7ae106da2d62f5866f43fc046181c5