Qt: Sort transactions by date

Conflicted transactions can get stuck at the top. This fixes that.

src/qt/overviewpage.cpp

@@ -218,7 +218,7 @@ void OverviewPage::setWalletModel(WalletModel *model)
         filter->setDynamicSortFilter(true);
         filter->setSortRole(Qt::EditRole);
         filter->setShowInactive(false);
-        filter->sort(TransactionTableModel::Status, Qt::DescendingOrder);
+        filter->sort(TransactionTableModel::Date, Qt::DescendingOrder);
 
         ui->listTransactions->setModel(filter.get());
         ui->listTransactions->setModelColumn(TransactionTableModel::ToAddress);