n-api,test: use module name macro

test_constructor_name.c should use NODE_GYP_MODULE_NAME.

PR-URL: https://github.com/nodejs/node/pull/16146


Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>