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

src/com/android/settings/accessibility/ToggleInversionPreferenceFragment.java

@@ -71,7 +71,7 @@ public class ToggleInversionPreferenceFragment extends ToggleFeaturePreferenceFr
     protected void onInstallSwitchBarToggleSwitch() {
         super.onInstallSwitchBarToggleSwitch();
 
-        mToggleSwitch.setCheckedInternal(
+        mSwitchBar.setCheckedInternal(
                 Settings.Secure.getInt(getContentResolver(), ENABLED, 0) == 1);
         mSwitchBar.addOnSwitchChangeListener(this);
     }