fix handler deregistration

Author: FireDragonGameStudio

Assets/SimpleWebRTC/Runtime/Scripts/Connections/WebRTCConnection.cs

@@ -154,7 +154,7 @@ private void OnDestroy() {
             // de-register events for connection
             webRTCManager.OnWebSocketConnection -= WebSocketConnectionChanged.Invoke;
             webRTCManager.OnWebRTCConnection -= WebRTCConnected.Invoke;
-            webRTCManager.OnDataChannelConnection += DataChannelConnected.Invoke;
+            webRTCManager.OnDataChannelConnection -= DataChannelConnected.Invoke;
             webRTCManager.OnDataChannelMessageReceived -= DataChannelMessageReceived.Invoke;
             webRTCManager.OnVideoStreamEstablished -= VideoTransmissionReceived.Invoke;
             webRTCManager.OnAudioStreamEstablished -= AudioTransmissionReceived.Invoke;

Assets/SimpleWebRTC/Runtime/Scripts/Connections/WebRTCConnection_Generic.cs

@@ -132,7 +132,7 @@ private void OnDestroy() {
 
             // de-register events for connection
             webRTCManager.OnWebRTCConnection -= WebRTCConnected.Invoke;
-            webRTCManager.OnDataChannelConnection += DataChannelConnected.Invoke;
+            webRTCManager.OnDataChannelConnection -= DataChannelConnected.Invoke;
             webRTCManager.OnDataChannelMessageReceived -= DataChannelMessageReceived.Invoke;
             webRTCManager.OnVideoStreamEstablished -= VideoTransmissionReceived.Invoke;
             webRTCManager.OnAudioStreamEstablished -= AudioTransmissionReceived.Invoke;