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video: Fix scaling in 4x horizontal co-sited chroma

Jan Schmidt requested to merge thaytan/gstreamer:chroma-4x-subsampling-fix into main

4x downscaling of chroma with co-sited chroma has never worked it seems.

Fixes incorrect videotestsrc output and videoconvert conversions to Y41B, YUV9, YVU9 and IYU9 with co-sited chroma.

e.g. gst-launch-1.0 videotestsrc ! video/x-raw,format=Y41B,width=1280,height=720 !
videoconvert ! autovideosink

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