🐛 Fix demo

Author: leochocolat

demo/index.js

@@ -1,6 +1,6 @@
 import scenes from './scenes';
 
 const urlParams = new URLSearchParams(location.search);
-const demoName = urlParams.get('demo');
+const demoName = urlParams.get('demo') || '';
 const scene = scenes[demoName.toLowerCase()] ? new scenes[demoName.toLowerCase()]() : new scenes.basic();
 scene.start();