module: fix check for package.json at volume root

This patch converts the "read package scope" algorithm's while loop
into a do-while loop enabling items at the filesystem root dir to
be considered within the scope of a sibling package.json also at the
filesystem root dir.

Fixes: https://github.com/nodejs/node/issues/33438



Co-authored-by: Guy Bedford <guybedford@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/34595


Reviewed-By: Jan Krems <jan.krems@gmail.com>
Reviewed-By: Mary Marchini <oss@mmarchini.me>