Added local cubemaps to validation tests

tests/validation/config.json

@@ -370,6 +370,11 @@
       "title": "GlowLayer",
       "playgroundId": "#LRFB2D#1",
       "referenceImage": "GlowLayer.png"
+    },
+    {
+      "title": "Local cubemaps",
+      "playgroundId": "#RNASML#4",
+      "referenceImage": "local cubemaps.png"
     }
   ]
 }