Fix QS notification scrim clipping being affected by offset

Applies compose QS fancy clipping before offset to avoid the top clipping being inadvertently affected by the composable's offset

Bug: 396050652
Test: manually verified the clipping no longer diverges from the notification scrim
Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Change-Id: I733685806f71c5804cd0b9173a616f5fc0af7abe