Update dehumidifier water tank to use light status

Use `airState.notificationExt` to get water tank status

Author: ankitmehtame

custom_components/smartthinq_sensors/wideq/devices/dehumidifier.py

@@ -27,7 +27,7 @@
 STATE_PM1 = ["SensorPM1", "airState.quality.PM1"]
 STATE_PM10 = ["SensorPM10", "airState.quality.PM10"]
 STATE_PM25 = ["SensorPM2", "airState.quality.PM2"]
-STATE_TANK_LIGHT = ["WatertankLight", "airState.miscFuncState.watertankLight"]
+STATE_TANK_LIGHT = ["WatertankLight", "airState.notificationExt"]
 
 STATE_POWER = [STATE_POWER_V1, "airState.energy.onCurrent"]