Revive the list footer for the message list

It was accidentally removed in Ia67e7f3e.

Change-Id: I071ad25e699a96d09017609dc4463c24d0d4eab3

src/com/android/email/activity/MessageListFragment.java

@@ -1236,6 +1236,7 @@ public class MessageListFragment extends ListFragment
 
             // Various post processing...
             autoRefreshStaleMailbox();
+            addFooterView();
             updateSelectionMode();
             showSendCommandIfNecessary();
             showNoMessageTextIfNecessary();