Fix unit conversion for Sensibo A/C units (home-assistant#10692)

* Fix unit conversion for Sensibo A/C units

When the Sensibo component was released, there was a provision to not convert the temperature units unless "nativeTemperatureUnit" was returned with the API. I'm not sure if the API changed on Sensibo's side, but I do not get this key passed back with API requests.

This causes my current temperature to be returned in CELSIUS instead of FAHRENHEIT.

Removing this fixes it, and I can confirm the units are shown properly now.

* Update adding comment showing temperature is always in C

homeassistant/components/climate/sensibo.py

@@ -133,10 +133,8 @@ def current_humidity(self):
     @property
     def current_temperature(self):
         """Return the current temperature."""
-        # This field is not affected by temperature_unit.
-        # It is always in C / nativeTemperatureUnit
-        if 'nativeTemperatureUnit' not in self._ac_states:
-            return self._measurements['temperature']
+        # This field is not affected by temperatureUnit.
+        # It is always in C
         return convert_temperature(
             self._measurements['temperature'],
             TEMP_CELSIUS,