fix: remove overlay because of bug in layer selector

Ref: agrc/kitchen-sink#460

Author: stdavis

src/components/MapContainer.tsx

@@ -60,7 +60,7 @@ export const MapContainer = ({ onClick }: { onClick?: __esri.ViewImmediateClickE
           'Topo',
           'Color IR',
         ],
-        referenceLayers: ['Address Points', 'Land Ownership', 'Overlay'],
+        referenceLayers: ['Address Points', 'Land Ownership'],
       },
     };