Revert "SystemUI: unbreak RecentsPanel with translucent decors."

This breaks RamBAR, fix it!

This reverts commit 9ed2fb06b68f3c6ea79cd7f26f4dffff5991240b.
Fix notification cutoff at slim dpi

Change-Id: I0dc2cc2a7748463c4392ba8d9145e3cc0d95edf2