Run AccessibilityGestureDispatchTest in portrait

The test is known to be highly sensitive various coordinate offsets
caused by navigation bar/status bar/etc
This fixes the orientation the test runs in to portrait to reduce the number
of moving parts that have the potential to cause its flakyness

Bug: 72512344
Test: ensure b/72512344 no longer reproduces
Change-Id: I98e09379e59a9673175c5fb8c9d62cbd2f6d7e76
1 file changed