Update local sandbox to point to local files

sandbox/public/index-local.html

@@ -35,6 +35,14 @@
         BABYLONDEVTOOLS.Loader
             .require("index.js")
             .load(() => {
+                BABYLON.DracoCompression.Configuration.decoder = {
+                    wasmUrl: "../../dist/preview%20release/draco_wasm_wrapper_gltf.js",
+                    wasmBinaryUrl: "../../dist/preview%20release/draco_decoder_gltf.wasm",
+                    fallbackUrl: "../../dist/preview%20release/draco_decoder_gltf.js"
+                };
+                BABYLON.GLTFValidation.Configuration = {
+                    url: "../../dist/preview%20release/gltf_validator.js"
+                };
             });
     </script>
 </body>