gtk3_kde5: Don't call deprecated QFileDialog::setConfirmOverwrite

QFileDialog documentation says [1]:

> This property is obsolete. It is provided to keep old source code
> working. We strongly advise against using it in new code.
>
> This property holds whether the filedialog should ask before accepting a
> selected file, when the accept mode is AcceptSave
>
> Use setOption(DontConfirmOverwrite, !enabled) or
> !testOption(DontConfirmOverwrite) instead.

Documentation on `QFileDialog::DontConfirmOverwrite` [2] says:

> QFileDialog::DontConfirmOverwrite	0x00000004	Don't ask for
> confirmation if an existing file is selected. By default confirmation is
> requested.

It already said that 10 years ago. Given that's the default,
there's no need to set it explicitly at all.

[1] https://doc.qt.io/qt-5/qfiledialog-obsolete.html#confirmOverwrite-prop
[2] https://doc.qt.io/qt-5/qfiledialog.html#Option-enum

Change-Id: I77a0022dc4128d157ba49c9aa8de447bb2c08379
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/131923
Tested-by: Michael Weghorn <m.weghorn@posteo.de>
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

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