D22372: Don't use deprecated QAbstractItemModel::reset()

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REVISION SUMMARY
  QAbstractItemModel::reset() is deprecated since Qt 5.0. It is strongly
  advised to use combination of QAbstractItemModel::beginResetModel() and
  QAbstractItemModel::endResetModel() instead.

REPOSITORY
  R108 KWin

BRANCH
  fix-warnings

REVISION DETAIL
  https://phabricator.kde.org/D22372

AFFECTED FILES
  tabbox/clientmodel.cpp

To: zzag, #kwin
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