smartlist: reset model when changing accounts

Change-Id: I0c00d35c5637cc4a8dd4b34778ad83351898c1ea

smartlistmodel.cpp

@@ -151,5 +151,7 @@ Qt::ItemFlags SmartListModel::flags(const QModelIndex &index) const
 void
 SmartListModel::setAccount(const std::string& accId)
 {
+    beginResetModel();
     accId_ = accId;
+    endResetModel();
 }