avfilter: fix YUV colorspace negotiation for YUVJ

Ironically, despite being introduced to make YUVJ unnecessary, the new
YUV negotiation logic failed to actually negotiate YUVJ formats
themselves correctly, leading to errors when passing YUVJ frames into
a filter graph. (They were effectively treated like RGB or Grayscale
formats, rather than as forced-full-range YUV, and hence did not have
their colorspace matrix correctly negotiated)

Fix this by splitting off the YUVJ check from ff_fmt_is_regular_yuv().
Obviously, we can trivially undo this change again once YUVJ is actually
deleted from the codebase.

Fixes: #11179

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