Tests: remove unused import

tests/devices/test_qoto_03_sprinkler.py

@@ -3,7 +3,7 @@
 from homeassistant.components.binary_sensor import BinarySensorDeviceClass
 from homeassistant.components.number import NumberDeviceClass
 from homeassistant.components.valve import ValveDeviceClass, ValveEntityFeature
-from homeassistant.const import PERCENTAGE, UnitOfTime
+from homeassistant.const import UnitOfTime
 
 from ..const import QOTO_SPRINKLER_PAYLOAD
 from ..helpers import assert_device_properties_set