D21401: Use native dialog overwrite check

[Méven Car]

meven added a task: T8552: Polish Open/Save dialogs.

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D21401

To: meven, ngraham, #frameworks, #kate
Cc: kwrite-devel, kde-frameworks-devel, domson, michaelh, ngraham, bruns, demsking, cullmann, sars, dhaumann
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