Fix .NET 10 version of full duplex sample

Author: abparticular

samples/fullduplex/Core_10/Server/RequestDataMessageHandler.cs

@@ -15,11 +15,7 @@ public async Task Handle(RequestDataMessage message, IMessageHandlerContext cont
 
         #region DataResponseReply
 
-        var response = new DataResponseMessage
-        {
-            DataId = message.DataId,
-            String = message.String
-        };
+        var response = new DataResponseMessage(message.DataId, message.String);
 
         await context.Reply(response);