Fix insets in QS.

When in split shade, if there's a camera cutout in the bottom, QS had a
significant amount of padding (as we were acounting for the cutout
twice).

Instead do the following:

* Have QS (container) go to the bottom always (by negating the container
  padding).
* Apply the desired qs bottom padding into compose. Only in QS.

Test: manual, multiple configurations unfolded and folded
Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Fixes: 404815434

Change-Id: I287e1cf5fbbebac8af6d6c3edde28360618ca0f0