libobs: Round up chroma sizes for odd resolutions

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When playing video, OBS can overflow and crash, or render video edges
incorrectly if the video resolution does not divide into 2 for trivial
chroma subsampling. This is fixed by rounding chroma plane sizes up
instead of down, and maintaining that through the video pipeline.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f