Tests: remove unused imports after removal of humidity sensors.

tests/devices/test_wetair_wawh1210lw_humidifier.py

@@ -5,7 +5,6 @@ from homeassistant.components.humidifier.const import (
     MODE_NORMAL,
     MODE_SLEEP,
 )
-from homeassistant.components.sensor import SensorDeviceClass
 from homeassistant.const import PERCENTAGE
 
 from ..const import WETAIR_WAWH1210_HUMIDIFIER_PAYLOAD

tests/devices/test_wilfa_haze_hu400bc_humidifier.py

@@ -1,7 +1,7 @@
 from homeassistant.components.humidifier import HumidifierEntityFeature
 from homeassistant.components.humidifier.const import MODE_AUTO, MODE_NORMAL
 from homeassistant.components.sensor import SensorDeviceClass
-from homeassistant.const import PERCENTAGE, UnitOfTemperature
+from homeassistant.const import UnitOfTemperature
 
 from ..const import WILFA_HAZE_HUMIDIFIER_PAYLOAD
 from ..helpers import assert_device_properties_set