Make sure `column-count` value gets clamped to [1, inf] when using the CSS-Typed-OM API.
Pull request: https://github.com/WebKit/WebKit/pull/7960
Committed 258218@main (58acbb968b73): <https://commits.webkit.org/258218@main> Reviewed commits have been landed. Closing PR #7960 and removing active labels.
<rdar://problem/103615242>