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video-converter: Fix for broken gamma remap with high bitdepth YUV output

Merged Seungha Yang requested to merge seungha.yang/gstreamer:videoconverter-gamma into main

Scale down the matrix before calculating RGB -> YUV matrix otherwise offset values will be wrong

Fixing pipeline videotestsrc ! video/x-raw,format=ARGB ! videoconvert gamma-mode=remap !
video/x-raw,format=P010_10LE,colorimetry="bt2020"