test: add coverage to dgram receive error case

This commit adds coverage for the case where a dgram socket
handle receives a message, but nread < 0, indicating an error.

PR-URL: https://github.com/nodejs/node/pull/11241


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>