Fixed setBrightness https://github.com/Xinyuan-LilyGO/T-Display-S3/is… #20

Job	Run time
build (examples/Arduino_GFXDemo/Arduino_GFXDemo.ino)	1m 34s
build (examples/Arduino_GFX_PDQgraphicstest/Arduino_GFX_PDQgraphicstest.ino)	1m 34s
build (examples/factory/factory.ino)	1m 24s
build (examples/GetBatteryVoltage/GetBatteryVoltage.ino)	50s
build (examples/I2CScan/I2CScan.ino)	37s
build (examples/ImageScroll/ImageScroll.ino)	53s
build (examples/lv_demos/lv_demos.ino)	1m 13s
build (examples/MPR121TouchSensor/MPR121TouchSensor.ino)	44s
build (examples/nes/nes.ino)	1m 57s
build (examples/ota/ota.ino)	1m 13s
build (examples/PCBClock/PCBClock.ino)	54s
build (examples/PokerS3/PokerS3.ino)	48s
build (examples/sd/sd.ino)	41s
build (examples/SerialExample/SerialExample.ino)	41s
build (examples/T-Display-S3-MIDI/T-Display-S3-MIDI.ino)	1m 13s
build (examples/tft/tft.ino)	46s
build (examples/TFT_Rainbow/TFT_Rainbow.ino)	51s
build (examples/touch_test/touch_test.ino)	5m 39s
build (examples/usb_hid_pad/usb_hid_pad.ino)	1m 5s
	24m 37s

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