Prosto PTC2000: use correct dps name for new select entity

custom_components/tuya_local/devices/prosto_ptc2000_heater.yaml

@@ -52,7 +52,7 @@ secondary_entities:
      dps:
        - id: 4
          type: string
-         name: level
+         name: option
          mapping:
            - dps_val: "normal"
              value: Full