D24399: Pass QDir by const & instead of copy

[Dominik Haumann]

dhaumann accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R244 KCoreAddons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24399

To: aacid, dhaumann
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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