[QDBusMenuBar] Guard m_window with a QPointer
It can be deleted without us knowing for MDI windows as happens in QtCurve config. Also always update m_window if it changes, even when null. BUG: 376340 BUG: 379719 FIXED-IN: 5.12.7 Differential Revision: https://phabricator.kde.org/D13774
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33a58844
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