Fix bug that changed brightness at each hsv update

The HSV setter should accept a percentage for the brightness
value but actually assumed the brightness to be in absolute values
between 1 and 255.
This resulted in brightness reductions at each HSV update, in
steps of 100% -> 100/255=39% -> 39/255=15% -> ... (see also
home-assistant/core#15582,
where I originally reported this bug).

pyHS100/smartbulb.py

@@ -145,7 +145,7 @@ def hsv(self, state: Tuple[int, int, int]):
         light_state = {
             "hue": state[0],
             "saturation": state[1],
-            "brightness": int(state[2] * 100 / 255),
+            "brightness": state[2],
             "color_temp": 0
             }
         self.set_light_state(light_state)