duplicate load

Playground/index.html

@@ -416,9 +416,6 @@
         <script src="https://preview.babylonjs.com/loaders/babylonjs.loaders.min.js"></script>
         <script src="https://preview.babylonjs.com/serializers/babylonjs.serializers.min.js"></script>
 
-        <script src="https://cdn.jsdelivr.net/gh/BabylonJS/Babylon.js@preview/dist/preview%20release/recast.js">
-        </script>
-
         <!-- Extensions -->
         <script src="https://cdn.jsdelivr.net/gh/BabylonJS/Extensions@master/ClonerSystem/src/babylonx.cloner.js" async>
         </script>