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Always remove starting window in performShow
When going to homescreen and then opening apps quickly again, the surface was not yet fully destroyed so we never triggered the codepath to remove the starting window in that case, so it was lingering around forever. Test: Open app, press home, reopen app immidiately again, make sure snapshot starting window is removed. Bug: 31339431 Change-Id: I946e681e7dc222e3dedfd3edacb8f37aee4a198b