Change the search UI on 2-pane

- Don't always show the search view.  Instead, show the search icon as an
  option menu.
- If the icon is tapped, show the search view.
- Don't show "Searching all contacts".  Just show the search view right
  next to the app icon.

This simply means to use the 1-pane search UI on 2-pane as well.

Bug 5055536

Change-Id: I9a4b16048285cd30975bcb2bae5ec3d01d15f20e