FIX: NavRing layout (2/2)
- cleaned up NavRing logic for different UI modes, it now shows on the bottom right in Dual Pane when portrait,
  and stays in the middle for all modes except standard Tablet UI in landscape
- the NavRing on Flipped Tablet mode behaves as it should (shows on left above the Navigation Area, but doesn't
  affect the Phone layout, unlike originally coded by AOKP)
- shrunk NavRing icon to fit with other category icons for mdpi devices
- threw in a couple of SystemUI restarts on Flipped Tablet and UMS Notification click