Update bluetooth summary text when state changes.

- Refresh connected state before setting summary text.
- Detect inconsistent state (BT manager says connected but doesn't
  provide a connected device)

(This basically syncs implementation between settings and QS tile)

Change-Id: Id23138f8432b9aecd194f5016bf2576e33e8ca98
Fixes: 33341275
Test: RunSettingsRoboTests

src/com/android/settings/dashboard/DashboardFragment.java

@@ -330,5 +330,6 @@ public abstract class DashboardFragment extends SettingsPreferenceFragment
             mDashboardTilePrefKeys.remove(key);
             mProgressiveDisclosureMixin.removePreference(screen, key);
         }
+        mSummaryLoader.setListening(true);
     }
 }