test: remove unused function arguments in async-hooks tests

Remove unused function arguments in two async-hooks tests.

PR-URL: https://github.com/nodejs/node/pull/24368


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>