Fix set brightness for Netatmo lights (#126075)

* fix set brightness for Netatmo lights

* round returns int by default

* Update homeassistant/components/netatmo/light.py

---------

Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

homeassistant/components/netatmo/light.py

@@ -173,7 +173,9 @@ def __init__(self, netatmo_device: NetatmoDevice) -> None:
     async def async_turn_on(self, **kwargs: Any) -> None:
         """Turn light on."""
         if ATTR_BRIGHTNESS in kwargs:
-            await self.device.async_set_brightness(kwargs[ATTR_BRIGHTNESS])
+            await self.device.async_set_brightness(
+                round(kwargs[ATTR_BRIGHTNESS] / 2.55)
+            )
 
         else:
             await self.device.async_on()
@@ -194,6 +196,6 @@ def async_update_callback(self) -> None:
 
         if (brightness := self.device.brightness) is not None:
             # Netatmo uses a range of [0, 100] to control brightness
-            self._attr_brightness = round((brightness / 100) * 255)
+            self._attr_brightness = round(brightness * 2.55)
         else:
             self._attr_brightness = None