Fix bug #15897505 Talk back state shows "off" while the talk back is still enabled.

- we were missing the update of the TextView from the SwitchBar so provide a new
setCheckedInternal() method that is doing the TextView and Switch update at the
same time

Change-Id: I6dd9c472a386bb534a58fbf5cf82d9d01fa74f6c
9 files changed