WM Wallpaper: Set offset and scale on WindowState level

When we set it on the WindowStateAnimator we are potentially
coming in to disagreement with scaling applied via the BLASTBufferQueue.

Bug: 188504567
Test: Repro from bug. Existing tests pass.
Change-Id: I7843fa12e52812a5cd3a3dd34114e0c6d58aecd3