add missing win32 constant for old win sdk

Zhao Yuhang

2025-03-11 c00e986f38dbc4843d92cc76a385f826658c1e03

 examples/qml/QWKButton.qml

@@ -1,5 +1,5 @@
import QtQuick 2.15
import QtQuick.Controls.Basic 2.15
import QtQuick.Controls 2.15

Button {
    id: root