D23959: Remove use of deprecated QModelIndex::child method

[Volker Krause]

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

REPOSITORY
  R201 Akregator

BRANCH
  deprecated-qmodelindex-call

REVISION DETAIL
  https://phabricator.kde.org/D23959

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