Update pins_arduino.h for lolin_c3_pico to define LED as RGB rather than the default GRB

Author: mitra42

variants/lolin_c3_pico/pins_arduino.h

@@ -16,6 +16,7 @@ static const uint8_t LED_BUILTIN = SOC_GPIO_PIN_COUNT + PIN_RGB_LED;
 // RGB_BUILTIN and RGB_BRIGHTNESS can be used in new Arduino API rgbLedWrite()
 #define RGB_BUILTIN    LED_BUILTIN
 #define RGB_BRIGHTNESS 64
+#define RGB_BUILTIN_LED_COLOR_ORDER LED_COLOR_ORDER_RGB
 
 static const uint8_t TX = 21;
 static const uint8_t RX = 20;