Update index.html

index.html

@@ -19,6 +19,6 @@ <h1>Mario Kart DS ARM9 Music Table Editor</h1>
 <select id="trackList" size="15" style="width: 200px;" onchange="onListboxSelect()">
 <!-- Track list options will be added dynamically -->
 </select>
-<script src="app.js"></script>
+<script src="code.js"></script>
 </body>
 </html>