Run `RepositionFixedPortraitAppTest` in both orientations

`RepositionFixedPortraitAppTest` runs only in portrait on some devices and landscape on others. Since the fixed portrait letterboxed app has a min aspect ratio now, it is always letterboxed so this test can be run in both orientations.

Flag: NONE(bug fix)
Fixes: 371080903
Test: atest WMShellFlickerTestsAppCompat:RepositionFixedPortraitAppTest
Change-Id: Ie1ba5c45b11fdda00412986e5b186fe3ea5d2068
1 file changed