SystemUI: Update no SIM status bar icon

* Correctly sized this time

Change-Id: Ifbe780e44001157e9453f08cb8301b8717558481
Fix up 'clear recents' UX.

Use the 'dismiss all' button drawable and place the button in the upper
right corner. Doing so fixes the broken animation when going into
recents.

Change-Id: I497a8b023f1872c5f9ae5df87af6ed2159e6b7b1