feat(asyncudp): revert license information to the source code

Author: SuGlider

libraries/AsyncUDP/examples/AsyncUDPClient/AsyncUDPClient.ino

@@ -1,17 +1,3 @@
-// Copyright 2024 Espressif Systems (Shanghai) PTE LTD
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 #include "WiFi.h"
 #include "AsyncUDP.h"