Correct comment SIZE_MAX to UINT16_MAX

include/gfx/color_set.hpp

@@ -12,7 +12,7 @@ public:
 	static constexpr size_t capacity = 4;
 
 private:
-	// Up to 4 colors, sorted, and where SIZE_MAX means the slot is empty
+	// Up to 4 colors, sorted, and where UINT16_MAX means the slot is empty
 	// (OK because it's not a valid color index)
 	// Sorting is done on the raw numerical values to lessen `compare`'s complexity
 	std::array<uint16_t, capacity> _colorIndices{UINT16_MAX, UINT16_MAX, UINT16_MAX, UINT16_MAX};