test: remove debugger workaround for AIX

Optimistically removing workaround code in the debugger test tool.

PR-URL: https://github.com/nodejs/node/pull/39296


Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>