[libcaca] minor bug in cucul/dither.c

[Sean D'Epagnier <sean@depagnier.com>]

Hi, I have found what I believe is a minor bug in libcucul.

On line 802 of dither.c the function cucul_get_dither_mode_list
returns 2x2 for 3 of the possible rendering modes, it should return
2x2 4x4 and 8x8.

also just above in cucul_set_dither_mode
ordered8 is not checked for so it is not possible to set.


these are all in const char* quotes.

Thanks,
Sean
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