[intl] NumberFormat v3 bug fix

Fix typo which cause morePrecision output for lessPrecision

Bug: v8:10776
Change-Id: I164abbdfa30ae1c4064a75abdd04fdbb1118dc0d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3501835


Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79392}