Fix issue #9683 "gui, wallet: random abort (segmentation fault) running master/HEAD".

Patch taken from @ryanofsky's comment
  https://github.com/bitcoin/bitcoin/issues/9683#issuecomment-448035913
and refined according to
  https://github.com/bitcoin/bitcoin/pull/15203#discussion_r249168229

src/qt/transactionview.cpp

@@ -229,8 +229,8 @@ void TransactionView::setModel(WalletModel *_model)
         transactionView->setAlternatingRowColors(true);
         transactionView->setSelectionBehavior(QAbstractItemView::SelectRows);
         transactionView->setSelectionMode(QAbstractItemView::ExtendedSelection);
+        transactionView->horizontalHeader()->setSortIndicator(TransactionTableModel::Date, Qt::DescendingOrder);
         transactionView->setSortingEnabled(true);
-        transactionView->sortByColumn(TransactionTableModel::Date, Qt::DescendingOrder);
         transactionView->verticalHeader()->hide();
 
         transactionView->setColumnWidth(TransactionTableModel::Status, STATUS_COLUMN_WIDTH);