Save BottomSheet state when screen rotate

- Save BottomSheet state in onSaveInstanceState
- When Settings starts from saved state, we don't need to
  add fragment. Because FragmentManager already contains
  fragment instance.
- Fix status bar color

Change-Id: Ic8779b8253040554409e735bd57bd9001c1d56fd
Fixes: 112428378
Test: make RunSettingsRoboTests