fix compile error on win

Zhao Yuhang

2023-12-22 0cedc474f38dca024f77ebf1d7ac5bf22c19744a

 src/core/contexts/cocoawindowcontext_p.h

@@ -25,6 +25,8 @@

    protected:
        void winIdChanged() override;
        bool windowAttributeChanged(const QString &key, const QVariant &attribute,
                                    const QVariant &oldAttribute) override;

    protected:
        WId windowId = 0;