Fix failing codemod test url-to-withrouter (#42109)

This test was failing when running

```
cd ./packages/next-codemod
pnpm build
pnpm test
```

packages/next-codemod/transforms/__testfixtures__/url-to-withrouter/using-inline-class.output.js

@@ -1,7 +1,7 @@
 import { withRouter } from "next/router";
 
-export default withRouter(class extends React.Component {
+export default withRouter((class extends React.Component {
   render() {
     const test = this.props.router
   }
-});
+}));