Remove local copy of KCalCore::DateList typedef
Summary:
We get the real one from the KCalCore/Incidence include above anyway,
and this way this code will automatically adjust to the SortableList
removal.
Reviewers: dvratil
Reviewed By: dvratil
Subscribers: kde-pim
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D20308