avfilter/paletteuse: add sierra3 dithering
Sierra3 according to https://bisqwit.iki.fi/jutut/kuvat/ordered_dither/error_diffusion.txt: * 5 3 2 4 5 4 2 2 3 2 / 32
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Sierra3 according to https://bisqwit.iki.fi/jutut/kuvat/ordered_dither/error_diffusion.txt: * 5 3 2 4 5 4 2 2 3 2 / 32