page-template: Fix a error

Signed-off-by: Ce Gao <ce.gao@outlook.com>

Author: gaocegege

templates/page_template.jinja

@@ -54,6 +54,6 @@
         </div>
         <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
         <script>window.jQuery || document.write('<script src="/javascript/jquery-1.9.1.min.js"><\/script>');</script>
-        <script src="javascript/site.js" type="text/javascript"></script>
+        <script src="/javascript/site.js" type="text/javascript"></script>
     </body>
 </html>