url: allow extension of user provided URL objects

PR-URL: nodejs#46989
Fixes: nodejs#46981
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

Author: aduh95

lib/internal/url.js

@@ -1170,9 +1170,9 @@ function urlToHttpOptions(url) {
     __proto__: null,
     ...url, // In case the url object was extended by the user.
     protocol: url.protocol,
-    hostname: url.hostname && StringPrototypeStartsWith(url.hostname, '[') ?
-      StringPrototypeSlice(url.hostname, 1, -1) :
-      url.hostname,
+    hostname: hostname && StringPrototypeStartsWith(hostname, '[') ?
+      StringPrototypeSlice(hostname, 1, -1) :
+      hostname,
     hash: url.hash,
     search: search,
     pathname: pathname,