test: remove unused parameters in function definition

Remove unused parameters triggerAsyncId and resource from oninit
function in test-async-await.js.

PR-URL: https://github.com/nodejs/node/pull/24268


Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>