D28008: Don't use deprecated QList::toSet

[Allan Sandfeld Jensen]

carewolf added reviewers: mlaurent, vkrause.

REPOSITORY
  R459 Akonadi Contacts

REVISION DETAIL
  https://phabricator.kde.org/D28008

To: carewolf, mlaurent, vkrause
Cc: kde-pim, fbampaloukas, dcaliste, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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