fix: do less work

Co-authored-by: steveoh <[email protected]>

Author: stdavis

src/components/MapContainer.tsx

@@ -72,11 +72,12 @@ export const MapContainer = ({ onClick }: { onClick?: __esri.ViewImmediateClickE
       },
     };
 
-    let { index: basemapIndex } = randomize(selectorOptions.options.basemaps!);
+    let basemapIndex: number;
     const basemapUrlParam = getUrlParameter<string>('basemap', 'string') as BasemapToken;
     if (basemapUrlParam) {
       basemapIndex = selectorOptions.options.basemaps!.indexOf(basemapUrlParam);
     } else {
+      basemapIndex = randomize(selectorOptions.options.basemaps!).index;
       setUrlParameter<string>('basemap', selectorOptions.options.basemaps![basemapIndex]! as string);
     }