Cleanup `OverrideMinAspectRatio` CTS tests Remove unecesary enable/disableCompatChanges annotations Add ApiTest and RequireFlagEnabled annotations Add Javadoc and comments for each test Fixes: 319256120 Test: atest CtsWindowManagerDeviceDisplay:CompatChangeTests Change-Id: I64a5e816056ea453669f28235a1cc98c77877e9e