Fixed fragment.substr type-o

Fixed Type-O

src/Materials/babylon.effect.js

@@ -162,7 +162,7 @@ var BABYLON;
                 return;
             }
             // Base64 encoded ?
-            if (fragment(0, 7) === "base64:") {
+            if (fragment.substr(0, 7) === "base64:") {
                 var fragmentBinary = window.atob(fragment.substr(7));
                 callback(fragmentBinary);
                 return;

src/Materials/babylon.effect.ts

@@ -211,7 +211,7 @@
             }
 
             // Base64 encoded ?
-            if (fragment(0, 7) === "base64:") {
+            if (fragment.substr(0, 7) === "base64:") {
             	var fragmentBinary = window.atob(fragment.substr(7));
             	callback(fragmentBinary);
             	return;