Fix bug 14990524 Add account does not refresh the list of accounts in the Dashboard

- unregister the OnAccountsUpdateListener in Fragment.onDestroy() instead of
in Fragment.onStop()

Change-Id: I07c92f85bb6efb34771d93158f00b60d93f4c90b

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

@@ -131,8 +131,8 @@ public class DashboardSummary extends Fragment implements OnAccountsUpdateListen
     }
 
     @Override
-    public void onStop() {
-        super.onStop();
+    public void onDestroy() {
+        super.onDestroy();
 
         if (mAccountListenerAdded) {
             AccountManager.get(getActivity()).removeOnAccountsUpdatedListener(this);