D28009: Don't use deprecated QSet::toList()

[Allan Sandfeld Jensen]

carewolf added a reviewer: mlaurent.

REPOSITORY
  R177 PIM: KIMAP

REVISION DETAIL
  https://phabricator.kde.org/D28009

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