[closebrackets demo] Make mode match editor content

demo/closebrackets.html

@@ -7,7 +7,7 @@
 <link rel="stylesheet" href="../lib/codemirror.css">
 <script src="../lib/codemirror.js"></script>
 <script src="../addon/edit/closebrackets.js"></script>
-<script src="../mode/xml/xml.js"></script>
+<script src="../mode/javascript/javascript.js"></script>
 <style type="text/css">
       .CodeMirror {border-top: 1px solid #888; border-bottom: 1px solid #888;}
     </style>