Update fixtures with Prettier formatting

src/fixtures/nuxt/async.js

@@ -1,15 +1,15 @@
-const getAllDynamicRoute = async function() {
+const getAllDynamicRoute = async function () {
   const routes = await (async () => {
-    return ['/posts/hello-world', '/posts/hello-again'];
-  })();
-  return routes;
-};
+    return ['/posts/hello-world', '/posts/hello-again']
+  })()
+  return routes
+}
 
 export default {
   mode: 'universal',
   generate: {
-    async routes () {
-      return getAllDynamicRoute();
+    async routes() {
+      return getAllDynamicRoute()
     }
   }
-};
+}