Fix Variant Folder

Author: SuGlider

boards.txt

@@ -1930,7 +1930,7 @@ esp32s3box3.build.bootloader_addr=0x0
 esp32s3box3.build.target=esp32s3
 esp32s3box3.build.mcu=esp32s3
 esp32s3box3.build.core=esp32
-esp32s3box3.build.variant=esp32s3box
+esp32s3box3.build.variant=esp32s3box3
 esp32s3box3.build.board=ESP32_S3_BOX_3
 
 esp32s3box3.build.usb_mode=1