Default to 444 and fix XYB Subsampling#136
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YCbCr/YCCK and XYB now use 444 by default, to improve image quality and allow JPEG XL Transcoding for XYB.
Using
--chroma_subsamplingwill now correctly subsample XYB's Blue channel.Fixes #122
Fixes libjxl/libjxl#2284 (properly)
Fixes libjxl/libjxl#3605