Update MlIconLayer.meta.json add demos property to ensure compatibility with catalogue update

Author: cioddi

src/components/MlIconLayer/MlIconLayer.meta.json

@@ -11,5 +11,10 @@
    "tags": ["Map layer"],
    "category": "layer",
    "type": "component",
-   "price": 0
+   "demos": [
+      {
+         "name": "Demo",
+         "url": "https://mapcomponents.github.io/react-map-components-maplibre-lab/iframe.html?id=mapcomponents-mliconlayer--catalogue-demo&viewMode=story"
+      }
+   ]
 }