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/widget/SwitchBar.java

@@ -100,6 +100,11 @@ public class SwitchBar extends LinearLayout implements CompoundButton.OnCheckedC
         mSwitch.setChecked(checked);
     }
 
+    public void setCheckedInternal(boolean checked) {
+        setTextViewLabel(checked);
+        mSwitch.setCheckedInternal(checked);
+    }
+
     public boolean isChecked() {
         return mSwitch.isChecked();
     }