inspector: proper WS URLs when bound to 0.0.0.0

JSON target list response will now return appropriate IP address
for instances listening on 0.0.0.0.

Backport of https://github.com/nodejs/node/pull/11755

PR-URL: https://github.com/nodejs/node/pull/11850
Refs: https://github.com/nodejs/node/issues/11591


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Italo A. Casas <me@italoacasas.com>
Reviewed-By: James Snell <jasnell@gmail.com>