Spotbug: remove toString() output concatenation

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/java/com/nextcloud/talk/webrtc/MagicWebSocketInstance.java

@@ -165,7 +165,7 @@ public class MagicWebSocketInstance extends WebSocketListener {
     @Override
     public void onMessage(WebSocket webSocket, String text) {
         if (webSocket == internalWebSocket) {
-            Log.d(TAG, "Receiving : " + webSocket.toString() + " " + text);
+            Log.d(TAG, "Receiving : " + webSocket + " " + text);
 
             try {
                 BaseWebSocketMessage baseWebSocketMessage = LoganSquare.parse(text, BaseWebSocketMessage.class);