D12328: Enable preview by default in the filepicker dialog

[Nathaniel Graham]

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

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D12328

To: anemeth, #frameworks, #vdg
Cc: ngraham, #frameworks, michaelh, bruns
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