fix: use specified transport channel instead of hardcoded reliablerpc channel (#638)

Author: 0xFA11

com.unity.multiplayer.mlapi/Runtime/Core/NetworkBehaviour.cs

@@ -161,7 +161,7 @@ public NetworkSerializer __beginSendClientRpc(ClientRpcParams clientRpcParams, R
                     rpcQueueContainer.SetLoopBackFrameItem(clientRpcParams.Send.UpdateStage);
 
                     //Switch to the outbound queue
-                    writer = rpcQueueContainer.BeginAddQueueItemToFrame(RpcQueueContainer.QueueItemType.ClientRpc, Time.realtimeSinceStartup, NetworkChannel.ReliableRpc, NetworkObjectId,
+                    writer = rpcQueueContainer.BeginAddQueueItemToFrame(RpcQueueContainer.QueueItemType.ClientRpc, Time.realtimeSinceStartup, transportChannel, NetworkObjectId,
                         ClientIds, RpcQueueHistoryFrame.QueueFrameType.Outbound, NetworkUpdateStage.PostLateUpdate);
 
                     if (!isUsingBatching)