fpreadjpeg: CorrectCMYK()

https://gitlab.com/freepascal.org/fpc/source/-/blob/main/packages/fcl-image/src/fpreadjpeg.pas

Bug: CorrectCMYK() does not convert from CMYK to RGB.
The wrong colors can be seen in TImage showing the file from cmykjpg.zip at: #21916 (closed).

Solution: Common default conversion.
This is the simplest solution, but is intended to resolve this report.
(To prevent possible endless waiting for complex alternatives (using color profiles))
fpreadjpeg.patch