Fix product key assignment in mower state manager

Author: mikey0000

pymammotion/data/mower_state_manager.py

@@ -307,7 +307,7 @@ def _update_net_data(self, message) -> None:
         match net_msg[0]:
             case "toapp_wifi_iot_status":
                 wifi_iot_status: WifiIotStatusReport = net_msg[1]
-                self._device.mower_state.product_key = wifi_iot_status.product_key
+                self._device.mower_state.product_key = wifi_iot_status.productkey
             case "toapp_devinfo_resp":
                 toapp_devinfo_resp: DrvDevInfoResp = net_msg[1]
                 for resp in toapp_devinfo_resp.resp_ids: