shithub: rgbds

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Fix grayscale sorting not setting palette size

A black+white palette would turn into white+transparent, removing black pixels
from the palette (the third slot would be empty, and the 4th slot be set directly)

--- a/src/gfx/pal_sorting.cpp

+++ b/src/gfx/pal_sorting.cpp

@@ -76,7 +76,7 @@

 	assert(palettes.size() == 1);

 	Palette &palette = palettes[0];

-	std::fill(palette.begin(), palette.end(), Rgba::transparent);

+	std::fill(palette.colors.begin(), palette.colors.end(), Rgba::transparent);

 	for (auto const &slot : colors) {

 		if (!slot.has_value() || slot->isTransparent()) {

 			continue;