Fix WebSocketServer response incorrectly stringifying the payload

packages/websocket-server/src/WebSocketServerService.ts

@@ -131,7 +131,7 @@ export abstract class WebSocketServerService<M extends Microservice> extends Int
 		socket.send(JSON.stringify(<IWebSocketResponse>{
 			type: "response",
 			requestId: request.requestId,
-			payload: JSON.stringify(result)
+			payload: result
 		}));
 	}