fix set brightness

Author: mchilli

circuitpython/utils/system.py

@@ -23,12 +23,10 @@ def decrease_brightness(app=None) -> None:
             app.macropad.display.brightness = brightness
             app.macropad.pixels.brightness = brightness
             app.macropad.pixels.show()
-            app.settings["brightness"] = brightness
 
     def increase_brightness(app=None) -> None:
         if app.macropad.display.brightness < 1:
             brightness = (round(app.macropad.display.brightness * 10) + 1) / 10
             app.macropad.display.brightness = brightness
             app.macropad.pixels.brightness = brightness
-            app.macropad.pixels.show()
-            app.settings["brightness"] = brightness
+            app.macropad.pixels.show()