Fix jank for translucent window transitions

When a translucent window is closing, the transition
animation to Launcher is janky because Launcher is
expected to be 'opening' but it has always been open
underneath the translucent window. Therefore, the
animation applied to the translucent app appears
janky.

bug:11253262
Change-Id: I9b6af3291d119e6927401f63785b12f25573f4eb