Update widget.js

Changed API endpoint to /stats, which gives the same information as the RomM dashboard in a much more easily handled fashion.

src/widgets/romm/widget.js

@@ -6,7 +6,7 @@ const widget = {
 
   mappings: {
     statistics: {
-      endpoint: "platforms",
+      endpoint: "stats",
     },
   },
 };