RTCVideoEncoderH264 should set kVTCompressionPropertyKey_RealTime to false if latency mode is not realtime
<rdar://problem/111381195>
Pull request: https://github.com/WebKit/WebKit/pull/15322
Committed 265560@main (2342117a550e): <https://commits.webkit.org/265560@main> Reviewed commits have been landed. Closing PR #15322 and removing active labels.