[Dual Shade] Temporarily disable notifications clipping.

The clipping was introduced in ag/31995137, but it inadvertently caused
an even more visible bug: it eliminated the shared element transition
of the notifications stack between the lock screen and shade.

The solution here might be a bit tricky, so this CL reverts the clipping
temporarily until we have a solution.

Fix: 411413281
Bug: 388475946
Bug: 391379412
Test: Manually tested by opening and closing both shades on both a
 folded and unfolded device, verifying the shared element transition
 of notification between the lock screen and shade appears correctly.
Flag: com.android.systemui.scene_container
Change-Id: I04c2fa4ca62d76567e9cc750cd4d26b4d9bedaf1