Add suggested uom to mop_drying_remaining_time in roborock (#168516)

Author: Thomas55555

homeassistant/components/roborock/sensor.py

@@ -257,6 +257,7 @@ def _dock_error_value_fn(state: DeviceState) -> str | None:
     RoborockSensorDescription(
         key="mop_clean_remaining",
         native_unit_of_measurement=UnitOfTime.SECONDS,
+        suggested_unit_of_measurement=UnitOfTime.HOURS,
         device_class=SensorDeviceClass.DURATION,
         value_fn=lambda data: data.status.rdt,
         translation_key="mop_drying_remaining_time",