un-skip the ssr loading e2e test in the app-router app

Author: dario-piotrowicz

examples/e2e/app-router/e2e/ssr.test.ts

@@ -4,8 +4,7 @@
 import { expect, test } from "@playwright/test";
 
 // NOTE: We don't await page load b/c we want to see the Loading page
-// loading.tsx doesn't currently work: https://github.com/opennextjs/opennextjs-cloudflare/issues/313
-test.skip("Server Side Render and loading.tsx", async ({ page }) => {
+test("Server Side Render and loading.tsx", async ({ page }) => {
   test.setTimeout(600000);
   await page.goto("/");
   await page.getByRole("link", { name: "SSR" }).click();