Changing OKX order book channel (#778)

* Switching from okex.com to okx.com

* Changing OKX order book channel

Author: BZ-CO

src/ExchangeSharp/API/Exchanges/OKGroup/ExchangeOKExAPI.cs

@@ -30,8 +30,8 @@ public sealed partial class ExchangeOKExAPI : OKGroupCommon
 		public override string BaseUrl { get; set; } = "https://www.okex.com/api/v1";
 		public override string BaseUrlV2 { get; set; } = "https://www.okex.com/v2/spot";
 		public override string BaseUrlV3 { get; set; } = "https://www.okex.com/api";
-		public override string BaseUrlWebSocket { get; set; } = "wss://ws.okex.com:8443/ws/v5";
-		public string BaseUrlV5 { get; set; } = "https://www.okex.com/api/v5";
+		public override string BaseUrlWebSocket { get; set; } = "wss://ws.okx.com:8443/ws/v5";
+		public string BaseUrlV5 { get; set; } = "https://www.okx.com/api/v5";
 		protected override bool IsFuturesAndSwapEnabled { get; } = true;
 
 		private ExchangeOKExAPI()
@@ -419,7 +419,7 @@ protected override async Task<IWebSocket> OnGetDeltaOrderBookWebSocketAsync(Acti
 			return await ConnectWebSocketOkexAsync(
 				async (_socket) =>
 				{
-					marketSymbols = await AddMarketSymbolsToChannel(_socket, "books-l2-tbt", marketSymbols);
+					marketSymbols = await AddMarketSymbolsToChannel(_socket, "books", marketSymbols);
 				}, (_socket, symbol, sArray, token) =>
 				{
 					ExchangeOrderBook book = token.ParseOrderBookFromJTokenArrays();