fix(color) remove extraneous cast for 8-bit color
This brings it in line with the corresponding macros for other BPP values.
This issue was found via CI added in the following commit.
@@ -142,7 +142,7 @@ enum {
# define LV_COLOR_GET_B8(c) (c).ch.blue
# define LV_COLOR_GET_A8(c) 0xFF
-# define _LV_COLOR_ZERO_INITIALIZER8 _LV_COLOR_MAKE_TYPE_HELPER {{0x00, 0x00, 0x00}}
+# define _LV_COLOR_ZERO_INITIALIZER8 {{0x00, 0x00, 0x00}}
# define LV_COLOR_MAKE8(r8, g8, b8) {{(uint8_t)((b8 >> 6) & 0x3U), (uint8_t)((g8 >> 5) & 0x7U), (uint8_t)((r8 >> 5) & 0x7U)}}
# define LV_COLOR_SET_R16(c, v) (c).ch.red = (uint8_t)((v) & 0x1FU)
