HeadsUp: Fix dismiss on back key press.

Change-Id: Ia213aeba114d153f5561622a2bea884963f3d8a1
frameworks: move safe volume warning above expanded volume panel

Fixes JIRA bug BACON-50

Change-Id: I1bc7c4781aa81cccd42281f70b394b7f7d81d3e5
Signed-off-by: Roman Birg <roman@cyngn.com>