test: fix misplaced ) in http response statuscode test

This fixes a misplaced parenthesis in each of the tests in
test/parallel/test-http-response-statuscodes.js, causing the tests to
pass as long as any error was thrown, without validating the error
message.

PR-URL: https://github.com/nodejs/node/pull/10692


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>