Don't use rotation to determine orientation

Looking more closely at documentation, rotation doesn't work as I
originally thought. ROTATION_0 is a device's *natural* resting state
which is portrait on phones but can differ for tablets or foldables.

The fix for this is to use the config value.

Test: manual - check that bubbles layout correctly on large tablet
Bug: 217211205
Change-Id: I3efc296d69d045be431b176f7acc71952b3f7bab