Take fixed rotation into account when setting the rounded corner frame

This CL uses the FixedRotationTransformDisplayBounds as the rounded
corner frame while the token is in fixed-rotation.

Fix: 346772491
Flag: NA
Test: run WindowPolicyTests#testWindowInsets during fixed-rotation
Change-Id: I356de4483e2e9b95e410cf7144d70c36f02443ca