util: fix util.inspect with proxied function

PR-URL: https://github.com/nodejs/node/pull/25244
Fixes: https://github.com/nodejs/node/issues/25212


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>