removing optional dependency

Tools/Gulp/config.json

@@ -37,11 +37,6 @@
                 "name": "earcut",
                 "module": "earcut",
                 "optional": true
-            },
-            {
-                "name": "INSPECTOR",
-                "module": "babylonjs-inspector",
-                "optional": true
             }
         ]
     },