fix possible QWKQuick crash

Zhao Yuhang

2025-05-07 576654b6173e97425411010b2f40b3e9519b85b8

 examples/shared/widgetframe/windowbutton.cpp

@@ -1,3 +1,7 @@
// Copyright (C) 2023-2024 Stdware Collections (https://www.github.com/stdware)
// Copyright (C) 2021-2023 wangwenx190 (Yuhang Zhao)
// SPDX-License-Identifier: Apache-2.0

#include "windowbutton.h"
#include "windowbutton_p.h"

@@ -6,11 +10,9 @@

namespace QWK {

    WindowButtonPrivate::WindowButtonPrivate() {
    }
    WindowButtonPrivate::WindowButtonPrivate() = default;

    WindowButtonPrivate::~WindowButtonPrivate() {
    }
    WindowButtonPrivate::~WindowButtonPrivate() = default;

    void WindowButtonPrivate::init() {
    }