Clean up some search nonIndexableKeys.

- Make the entire gesture setting page unsearchable. This is safe
  because each row in gesture setting page lead to a child page, we are
  only removing duplicates.
- Make the pref controller for System -> gesture return
  AVILABLE_UNSEARCHABLE so it's also suppressed.
- Suppres the parent page for adaptive brightness.

Bug: 72748524
Test: manual
Change-Id: Id7317f5f126af88b1bde8d87b8a206d9909df904