Fix connected trees example - add node handles to correct element

Author: Niels Dequeker

examples/views/connected-trees.html

@@ -12,8 +12,8 @@
   </ol>
 </script>
 <script type="text/ng-template" id="nodes_renderer2.html">
-  <div ui-tree-handle class="tree-node">
-    <div class="pull-left tree-handle">
+  <div class="tree-node">
+    <div class="pull-left tree-handle" ui-tree-handle>
       <span class="glyphicon glyphicon-list"></span>
     </div>
     <div class="tree-node-content">