Compute configuration orientation by available screen size

It aligns the same calculation as
TaskFragment#computeConfigResourceOverrides.

Otherwise when the display size is close to square and there are
decor windows, the configuration of activity and non-activity
component will be inconsistent.

Bug: 233855302
Test: atest DisplayContentTests#testOrientationForAspectRatio
Change-Id: If6a1d5e28b51b14a2d154872b3e65f6b3c82c101