loader: remove unused error code in module_job

PR-URL: https://github.com/nodejs/node/pull/21354


Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>