D9767: Fix mem leak. It seems that setting is never deleted

[Laurent Montel]

mlaurent added a reviewer: dvratil.

REPOSITORY
  R165 Akonadi

REVISION DETAIL
  https://phabricator.kde.org/D9767

To: mlaurent, dvratil
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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