test: improve coverage for `question` in readline

PR-URL: https://github.com/nodejs/node/pull/38799
Refs: https://coverage.nodejs.org/coverage-dc43066ee9a37655/lib/readline.js.html#L443


Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>