graph_editor: do not include jquery in the gadget

It causes {msg: "jsPlumb: unknown connector type 'StateMachine'"} problem when jquery was already loaded

bt5/erp5_graph_editor/SkinTemplateItem/portal_skins/erp5_graph_editor/dream_graph_editor/jsplumb/index.html.html

@@ -9,7 +9,11 @@
     <script src="renderjs.js" type="text/javascript"></script>
     <script src="rsvp.js" type="text/javascript"></script>
 -->
+<!--
+  FIXME: Including jQuery twice cause the jsplumb to be loaded twice.
+  For now we assume that it has already been loaded at this point.
     <script src="../lib/jquery.js"  type="text/javascript"></script>
+-->
     <script src="../lib/jquery-ui.js"  type="text/javascript"></script>
     <script src="../lib/jquery.jsplumb.js" type="text/javascript"></script>
     <script src="../lib/handlebars.min.js" type="text/javascript"></script>