This fixes a test issue with internalCropUsedIfNoSystemCropperFound.
A bitmap must be created or the internal cropping will fail. This
wasn't picked up before because files from previous tests were not
being cleared properly - this also corrects that behaviour.
Bug: 223498130
Test: atest AvatarPhotoControllerTest
Change-Id: I3b550e94bea5894f984122bce420144355ea1cb4
046d339d78