Non working upload button.

src/snek/templates/web.html

@@ -5,7 +5,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Snek</title>
   <style>{{highlight_styles}}</style>
-  <script src="/media-upload.js"></script>
+  <script src="/upload-button.js"></script>
   <script src="/html-frame.js"></script>
   <script src="/schedule.js"></script>
   <script src="/app.js"></script>