Fix KuCoin average price

[v36u]

When interacting with the KuCoin orders API, the price field is always returned with the value 0. Luckily, there are two other documented fields we can use to calculate the average price: dealFunds (the amount of base (e.g., USDT) spent/received) and dealSize (the amount of target (e.g., BLUR) spent/received).
Example responses:

{
    "code": "200000",
    "data": {
        "id": "<redacted>",
        "symbol": "BLUR-USDT",
        "opType": "DEAL",
        "type": "market",
        "side": "sell",
        "price": "0",
        "size": "25",
        "funds": "0",
        "dealFunds": "11.275",
        "dealSize": "25",
        "fee": "0.015785",
        "feeCurrency": "USDT",
        "stp": "",
        "stop": "",
        "stopTriggered": false,
        "stopPrice": "0",
        "timeInForce": "GTC",
        "postOnly": false,
        "hidden": false,
        "iceberg": false,
        "visibleSize": "0",
        "cancelAfter": 0,
        "channel": "API",
        "clientOid": "<redacted>",
        "remark": null,
        "tags": null,
        "isActive": false,
        "cancelExist": false,
        "createdAt": 1704809539502,
        "tradeType": "TRADE"
    }
}

{
    "code": "200000",
    "data": {
        "id": "<redacted>",
        "symbol": "BLUR-USDT",
        "opType": "DEAL",
        "type": "market",
        "side": "buy",
        "price": "0",
        "size": "0",
        "funds": "33.7429",
        "dealFunds": "33.74289428",
        "dealSize": "75.3526",
        "fee": "0.047240051992",
        "feeCurrency": "USDT",
        "stp": "",
        "stop": "",
        "stopTriggered": false,
        "stopPrice": "0",
        "timeInForce": "GTC",
        "postOnly": false,
        "hidden": false,
        "iceberg": false,
        "visibleSize": "0",
        "cancelAfter": 0,
        "channel": "WEB",
        "clientOid": null,
        "remark": null,
        "tags": null,
        "isActive": false,
        "cancelExist": false,
        "createdAt": 1704809877399,
        "tradeType": "TRADE"
    }
}