remove already defined

Author: Jason2866

examples/arduino-blink/platformio.ini

@@ -48,7 +48,6 @@ custom_component_remove = espressif/esp_hosted
 platform = espressif32
 framework = arduino
 board = arduino_nano_esp32
-build_flags = -DLED_BUILTIN=48
 monitor_speed = 115200
 custom_component_remove = espressif/esp_hosted
                           espressif/esp_wifi_remote