Add check in #shouldReverseRotationDirectionAroundZAxis

... to return false for non-default displays. The property that it
uses (config_deviceStatesToReverseDefaultDisplayRotationAroundZAxis)
indicates that it should only apply to default displays.

Fixes: 281939489
Test: Steps in b/281939489#comment#11
Test: atest DisplayRotationTests
Test: Rear display mode rotation with and without rotation lock
Change-Id: I0d9d606b22c8cc5f2710b782faad2b44343d6462