Update WebCodecsVideoFrame color space to create a valid VideoColorSpace even when closed
<rdar://problem/111679281>
Pull request: https://github.com/WebKit/WebKit/pull/15498
Committed 265748@main (b350aafef14d): <https://commits.webkit.org/265748@main> Reviewed commits have been landed. Closing PR #15498 and removing active labels.