Update message timesamps on resume.

Fixes #2519.
Closes #2593

// FREEBIE

src/org/thoughtcrime/securesms/ConversationListFragment.java

@@ -109,6 +109,7 @@ public class ConversationListFragment extends ListFragment
     super.onResume();
 
     initializeReminders();
+    ((ConversationListAdapter)getListAdapter()).notifyDataSetChanged();
   }
 
   @Override