src: remove extra copy from Copy() in node_url.cc

The was copying the whole array and the strings in it without
any benefit.

PR-URL: https://github.com/nodejs/node/pull/14907


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>