Fix group list scroll position resetting issue

- Clear mSelectionToScreenRequested once requestSelectionToScreen() is called.
- Do requestSelectionToScreen() only when selection is visible (i.e. on tablet)
- Also removed unnecessary ListView.save/restoreState.  There was no code between
  these.

Bug 5221320

Change-Id: Ie3dd466b4f3f84562ffec4c72a8026f5833a0b5d