Change rachel-esp32 gamma parameter (ducalex#176)

Author: ioiotor

components/retro-go/targets/rachel-esp32/config.h

@@ -46,8 +46,8 @@
     ILI9341_CMD(0xF6, 0x01, 0x30);                                                                                              \
     ILI9341_CMD(0xF2, 0x00);                                                                                                    \
     ILI9341_CMD(0x26, 0x01);                                                                                                    \
-    ILI9341_CMD(0xE0, 0xD0, 0x00, 0x05, 0x0E, 0x15, 0x0D, 0x37, 0x43, 0x47, 0x09, 0x15, 0x12, 0x16, 0x19);                      \
-    ILI9341_CMD(0xE1, 0xD0, 0x00, 0x05, 0x0D, 0x0C, 0x06, 0x2D, 0x44, 0x40, 0x0E, 0x1C, 0x18, 0x16, 0x19);                      \
+    ILI9341_CMD(0xE0, 0xD0, 0x00, 0x02, 0x07, 0x0a, 0x28, 0x32, 0x44, 0x42, 0x06, 0x0e, 0x12, 0x14, 0x17);                      \
+    ILI9341_CMD(0xE1, 0xD0, 0x00, 0x02, 0x07, 0x0a, 0x28, 0x31, 0x54, 0x47, 0x0E, 0x1C, 0x17, 0x1b, 0x1e);                      \
     ILI9341_CMD(0x11);                                                                                                          \
     ILI9341_CMD(0x29);