Fix CutoutSpecification logic bug

if the specification contains all of left, top, right, and bottom bind
cutout, the bottom cutout rect return null. But, it should be non-null.

The specification that contains bottom right corner cutout assigned to long
edge in phone like device can't be achieved. But, it should be achieved.

Test:  atest \
    FrameworksCoreTests:android.view.DisplayCutoutTest \
    FrameworksCoreTests:android.view.CutoutSpecificationTest \
    SystemUITests:com.android.systemui.ScreenDecorationsTest \
    CorePerfTests:android.view.CutoutSpecificationBenchmark

Fixes: 149675352

Change-Id: I6c742f93e72627f1d58b8ce971a4b1cc9792d5cf