fix: improve handling of fan percentage to better match blueair in ap…

…p values, improvement provided by rainwoodman

custom_components/ha_blueair/fan.py

@@ -107,10 +107,7 @@ def is_on(self) -> int:
     @property
     def percentage(self) -> int:
         """Return the current speed percentage."""
-        current_speed = int(round(self._device.fan_speed / self._device.speed_count * 100))
-        if current_speed == 51:
-            current_speed = 50
-        return current_speed
+        return int((self._device.fan_speed * 100) // self._device.speed_count)
 
     async def async_set_percentage(self, percentage: int) -> None:
         await self._device.set_fan_speed(int(round(percentage / 100 * self._device.speed_count)))