http: fix `request` when `setHost` is `true`

Fixes: https://github.com/nodejs/node/issues/19457

PR-URL: https://github.com/nodejs/node/pull/19502


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>