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: I4538bd665dfef0febc297a3edca7b1ed97b34d23
Merged-In: I4538bd665dfef0febc297a3edca7b1ed97b34d23