PSM: Fix typo in PSM tests

This CL is fixing a typo existed in PSM tests.

Bug: 1242309
Change-Id: Id7c0993a9ae061fd63e437d83ac3233b70ac2cfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3144000


Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Amr Aboelkher <amraboelkher@chromium.org>
Cr-Commit-Position: refs/heads/main@{#918735}