test: handle errors correctly in GC http test

In test-gc-http-client-timeout.js, res.resume is not a function if error
occurs. Remove the error handler.

PR-URL: https://github.com/nodejs/node/pull/22185


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>