[Dual Shade] Define the user action distance for the notification shade.

This also fixes it for quick settings shade, which used a heuristic so
far instead of the actual shade height.

Fix: 390608413
Test: Tested manually on a device by expanding the notifications shade.
Flag: com.android.systemui.scene_container
Flag: com.android.systemui.dual_shade
Change-Id: Ia63db02f4596d6c4cc395ab8d63226b3bef215b0