Originally, the check "if (orientation == ULOC_LAYOUT_LTR)" lead dir
to be "rtl" when orientation is "ltr". Fix it to correct check
"if (orientation == ULOC_LAYOUT_RTL)"

Bug: v8:12531
Change-Id: I5fba29466c66b4fd05e31ddbe4083c16c19e9005
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3459928Reviewed-by: Frank Tang <ftang@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79213}