Remove Language and Input duplicates

Change the keys in the Language and Input screen for the
gesture and tts-output settings so they can be disabled
in search. Then change the preference controllers to take
a key as input to avoid crashes on the other screens with
these settings.

Test: make RunSettingsRoboTests
Bug: 33701673
Change-Id: Ifeb2a2d34a3efded3f0a9ba02ac76fd6f8ffd087
Merged-In: I8bc0776131fcac5a6edf7e8271bc53252c2fc719