Update ChangeAppRotation test

Updating the ChangeAppRotationTest test, adding new WM and layers
assertions. Also fixing the command to run this test in the comment at
the beginning.

Test: atest FlickerTests:ChangeAppRotationTest
Bug: b/171049719
Change-Id: I24a4bc74690363036174da1a2683c932ca349ec1
1 file changed