[sheriff] Update expectation for...

[sheriff] Update expectation for external/wpt/html/semantics/embedded-content/media-elements/ready-states/autoplay-hidden.optional.html on Mac10.14.

Bug: 1232504
Change-Id: Id7c9f4d4aa9797f813b8d9cb0e63a327ca0734ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4415059
Commit-Queue: Francois Pierre Doray <fdoray@chromium.org>
Auto-Submit: Francois Pierre Doray <fdoray@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1128696}