Revert "WIP - FAB Clear Recents"

This reverts commit c1f1b6d6509877ef87e9f2d8a2157971773ca62f.
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