util: change %o depth default

Since the default for depth is changed to `20` it is logical
to change the %o default as well. It will now always use the
default depth.

PR-URL: https://github.com/nodejs/node/pull/17907
Refs: https://github.com/nodejs/node/issues/12693

PR-URL: https://github.com/nodejs/node/pull/22846


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>