Fix property name in css/css-typed-om/the-stylepropertymap/properties/background-repeat.html WPT test.
Pull request: https://github.com/WebKit/WebKit/pull/7957
Committed 258199@main (40db70745726): <https://commits.webkit.org/258199@main> Reviewed commits have been landed. Closing PR #7957 and removing active labels.
<rdar://problem/103603460>