D24946: Port away from deprecated KIconThemes methods

[Volker Krause]

vkrause added a task: T11865: Deprecate KIconTheme::assignIconsToContextMenu.

REPOSITORY
  R86 PIM: Text Editor

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24946

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