Moebot: add missing RAIN_PARK problem state

Discussion #758

custom_components/tuya_local/devices/moebot_s_mower.yaml

@@ -121,6 +121,9 @@ secondary_entities:
           - dps_val: BATTERY_NOT_ENOUGH
             value: Low battery
             icon: "mdi:battery-low"
+          - dps_val: RAIN_PARK
+            value: Raining
+            icon: "mdi:weather-pouring"
   - entity: switch
     name: Rain mode
     icon: "mdi:weather-pouring"