D7440: Turn on Dolphin icon previews by default

[Nathaniel Graham]

ngraham added a reviewer: VDG.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D7440

To: ngraham, #dolphin, #kde_applications, #vdg
Cc: anthonyfieroni, davidedmundson, ltoscano, dfaure, elvisangelaccio, #konqueror, navarromorales, firef, andrebarros, emmanuelp
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