Better extensionRoutes.keys() iteration (#2031)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/renderer/components/app.tsx

@@ -174,11 +174,11 @@ export class App extends React.Component {
       }
     });
 
-    Array.from(this.extensionRoutes.keys()).forEach((menu) => {
+    for (const menu of this.extensionRoutes.keys()) {
       if (!rootItems.includes(menu)) {
         this.extensionRoutes.delete(menu);
       }
-    });
+    }
   }
 
   renderExtensionTabLayoutRoutes() {