[Flexiglass] Set NSSL drawbounds from the GONE Scene

NSSL received incorrect draw bounds while there was a HUN over
Scenes.GONE. This was a temporarily measure here, and didn't cause any
issues in the current code, but these 0 values were technically
incorrect and misleading in the current NSSL code.

Bug: 417965077
Test: check HUN transitions over GONE
Test: check GONE -> Shade transition by dragging on a HUN
Flag: com.android.systemui.scene_container
Change-Id: I92a7798f8b52c52014e7cecc953dba26b82d5af7