averne a49108fd29 avcodec/proresdec: Remove grayscale hack ...

This was introduced in commit 9c43703, to support a codec "extension"
in the prores_aw encoder.
This removes the chroma fill loop, and instead performs the inverse
transform on null coefficients, which achieves the same result and
fixes an off-by-one in the chroma values produced.

Updated test to reflect this change.

2025-08-02 06:11:39 +00:00

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