Fix typo in popover nesting WPT
The popover=manual test accidentally used a popover=auto.
Change-Id: If507503dabc338cd636f14c1ec03f7c2b97fe32c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5991854
Auto-Submit: Mason Freed masonf@chromium.org
Reviewed-by: Di Zhang dizhangg@chromium.org
Commit-Queue: Di Zhang dizhangg@chromium.org
Commit-Queue: Mason Freed masonf@chromium.org
Cr-Commit-Position: refs/heads/main@{#1378404}