Don't enable search enhancement on Android 2

The search input isn't the input that's used in the SearchOverlay
overlay. In the click handler of the former the latter can't be
focussed to bring up the virtual keyboard, so hide the search form
elements for now.

Bug: T76882
Change-Id: Ic5a3a441f8a88587282e3eda5415ee874fc96a48
Merge "Don't enable search enhancement on Android 2"