QDialog: Pass transient parent as a parent to native dialogs

Sometimes it's needed to show a native dialog for another process,
for example in xdg-desktop-portal-kde. In this case we have WId
of a parent window which can be used for calling
QWindow::setTransientParent(QWindow::fromWinId(...)).

Pass this transient parent to a native dialog so it could use
it as a transient parent for itself. Rename
QDialogPrivate::parentWindow() for clarity.

Change-Id: I68974ddea35f9366a0ddffe602d9d028f45e26fa
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

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