Fix TaskView cropping for transient taskbar

TaskView clipping is not necessary anymore because task in Overview will always be the same aspect ratio as the app when in fullscreen.

Fix: 268211636
Test: manual trigger of Overview (landscape, portrait, split screen)
Change-Id: Ib4faeda6f0cccef3b23fcbacb89c6d2832c0df59
Merged-In: Ib4faeda6f0cccef3b23fcbacb89c6d2832c0df59