[1/n] Fix initial bounds flicker test

The initial bounds for desktop windowing are always positioned as if the
pinned taskbar is enabled regardless of what taskbar mode is actually
being used. Update flicker test setup to always used pinned taskbar.

Add display orientation rule to force device to run in desired
orientation.

Flag: NONE(bug fix)
Fix: 358363550
Fix: 364610475
Test: atest EnterDesktopWithDragLandscape
Test: atest EnterDesktopWithDragPortrait
Change-Id: Ied6a8b50a3e1aa13fe136650d0861ca87def4976