test: remove extra process.exit()

process.exit() has a tendency to hide test failures because
it forces the process to exit. This test doesn't need the
process.exit(), so this commit removes it.

PR-URL: https://github.com/nodejs/node/pull/29873


Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>