test: add test case to test-http-response-statuscode.js

Change regular expression of error message.
Add test case(`res.writeHead()`).

PR-URL: https://github.com/nodejs/node/pull/10808


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>