Bug 1859587 [wpt PR 42583] - Remove tentative from filename of dir-sl…

…ots-directionality.html., a=testonly

Automatic update from web-platform-tests
Remove tentative from filename of dir-slots-directionality.html.

whatwg/html#9796 has landed, so this is now
specified, and the test no longer should be labeled as tentative.

Bug: 576815
Change-Id: Ica2371532c761da678c38237e4bdd9b991388f1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4948050
Auto-Submit: David Baron <dbaronchromium.org>
Reviewed-by: Di Zhang <dizhanggchromium.org>
Commit-Queue: Di Zhang <dizhanggchromium.org>
Cr-Commit-Position: refs/heads/main{#1210887}

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wpt-commits: f84c5af86a97af47983ec10ec6b56b905692d8e6
wpt-pr: 42583

UltraBlame original commit: 91728099be29f0ec62e88282bc45515c61b4ac7c