Revert "Remove Live Captions button from the Volume Dialog when the new Volmue Panel is enabled"

This reverts commit 0e0bc102.

Reason:
* Live caption is now shown in the new volume panel but we don't
  use it so it's not available to the user.
* So bring it back as like 14 on the bottom of the volume
  dialog.

Change-Id: Ia54cccf50c2b9b625d376a0a0165417f0c665184