Settings: Remove unnecessary padding from HeadsUpSettings.

Change-Id: I823aa97f32049dc6c6baf6c859c47219952fe454
Fix heads up action bar switch handling for tablets.

Similar to commit 91f47b9f55467f1c8de4c6c732375d9f6f3c3942.

Change-Id: Ia4c5e8169ccd6786d2284eccec30397cac48d218