Fixing issue with prediction bar apps erroneously being tapped.

- requestDisallowIntercept is not called unless the recycler view
  scrolls so when over scrolling, we still need to check the distance
  to ensure we stop long pressing when the touch moves outside the
  slop
- Ensure that we don't allow tapping the prediction bar icons under
  the search bar

Change-Id: I520c05fa77911340d4747bb469918812b192769e