Revert to await but add timeout instead. (#377)

Reverts back to await, though if someone is smart they can get `timeout + 1.5` seconds of execution time.

Author: terjanq

dist/challenge-templates/xss-bot/challenge/bot.js

@@ -53,7 +53,9 @@ if (BLOCK_SUBORIGINS) {
     const page = await context.newPage();
     await page.setCookie(cookie);
     socket.write(`Loading page ${url}.\n`);
-    page.goto(url);
+    await page.goto(url, {
+      timeout: 1500  /* add 1.5s margin for network delays */
+    });
     setTimeout(()=>{
       try {
         context.close();