D24782: Port away from deprecated BarIcon method

[Volker Krause]

vkrause added a task: T11654: Deprecate SmallIcon/DesktopIcon/BarIcon/UserIcon/MainBarIcon and KDE::icon in favor of KIconLoader or QIcon API.

REPOSITORY
  R75 PIM: Calendar Support

REVISION DETAIL
  https://phabricator.kde.org/D24782

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