Revert "Make settings themed apps have light nav"

This reverts commit 45484206.

The above change causes restart due to ClassCastException.

Test: Manually:
      1. Open the Dialer app.
      2. Focus into the edit field to show the IME.
      3. Open the notification shade.
      4. Tap the gear icon to show the system settings.
      5. Make sure the system no longer restarts due to
         ClassCastException.
Bug: 63630024
Fixes: 65413752
Change-Id: I4a17ba2f8d70f99009f091c2aaad5cd5f4e9b31c