Revert to overview coming from the side instead of bottom

Test: Visually checking all of these. As appropriate, repeat in 0, 2, 3
button modes, landscape/portrait/fake landscape, and 3P launcher
- Quick switch from home
- Home to overview
- Overview to home (swipe up)
- Overview to home (tap outside)
- Overview to home (back invocation)
- Quick switch from app
- Swipe up and hold from app
- Dismiss an app
- Empty recents
- Split select state to home
- Modal state to home
Fixes: 185411781

Change-Id: If00a22fee35c832a259bfc62808efbac5990ce2e