Drive by fix of type of expected value in a test

Bug: v8:9626
Change-Id: I1bb44082b873383ea75e7089828bc68c9d4e0df0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1757503Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63727}