Fix validation test

tests/validation/webgpu.json

@@ -80,7 +80,7 @@
         {
             "title": "show multiple guis",
             "renderCount": 5,
-            "playgroundId": "#6X9UMD#11"
+            "playgroundId": "#6X9UMD#12"
         },
         {
             "title": "skybox with boombox",