Update benchmarks/websocket/websocket-echo.mjs

Co-authored-by: Khafra <maitken033380023@gmail.com>

Author: tsctx

benchmarks/websocket/websocket-echo.mjs

@@ -17,7 +17,7 @@ const binary = randomBytes(__BINARY_SIZE__)
 
 server.on('connection', (socket) => {
   socket.on('message', (data, _isBinary) => {
-    socket.send(data)
+    socket.send(data, { binary: _isBinary })
     // socket.close();
   })
 })