Update index.js

Playground/js/index.js

@@ -87,7 +87,7 @@
         var zipCode;
         BABYLON.Engine.ShadersRepository = "/src/Shaders/";
 
-        if (location.href.indexOf("Stable") !== -1) {
+        if (location.href.indexOf("indexstable") !== -1) {
             setToMultipleID("currentVersion", "innerHTML", "Version: Stable");
         } else {
             setToMultipleID("currentVersion", "innerHTML", "Version: Latest");