Make QS switch to Split Shade on unfold

This aligns the scene container implementation of the shade with the
legacy implementation to fix b/360102562.

Fixes: 360102562
Test: expand shade, unfold, expand shade, fold
Test: added new test
Flag: com.android.systemui.scene_container
Change-Id: I70f1c1719d6879713ceb501b09eed03544ba7e72
3 files changed