CodeDiff: Remove unused file variables

Some files are not used, they can be omitted.

templates/diff_template.html

@@ -11,7 +11,6 @@
           modified_code: full html contents of modified file
           jquery_js:     path to jquery.min.js
           diff_js:       path to diff.js
-          comment_js:    path to comment.js
         -->
         <meta charset="utf-8">
         <title>
@@ -74,6 +73,5 @@
         </div>
 <script src="%(jquery_js)s" type="text/javascript"></script>
 <script src="%(diff_js)s" type="text/javascript"></script>
-<!--<script src="%(comment_js)s"></script>-->
     </body>
-</html>
+</html>