Update ESP32_Dev_Kit_V1_ILI9488_Resistive.h

Added `#define TFT_BACKLIGHT_ON HIGH` Because it is sometimes needed.

user_setup.h Examples/ESP32_Dev_Kit_V1_ILI9488_Resistive.h

@@ -9,6 +9,7 @@ This version is for a 38-pin ESP32 DevKitC and an ILI9488 screen with resistive
 #define ILI9488_DRIVER     // WARNING: Do not connect ILI9488 display SDO to MISO if other devices share the SPI bus (TFT SDO does NOT tristate when CS is high)
 
 #define TFT_BL   32            // LED back-light control pin
+#define TFT_BACKLIGHT_ON HIGH  // Level to turn ON back-light (HIGH or LOW)
 
 #define TFT_MISO 19
 #define TFT_MOSI 23