fix: repaint columns list after move up/down a column

Was reported in the forum: https://www.heidisql.com/forum.php?t=44760

Author: ansgarbecker

source/table_editor.pas

@@ -1369,6 +1369,7 @@ procedure TfrmTableEditor.ValidateColumnControls;
   menuRemoveColumn.Enabled := btnRemoveColumn.Enabled;
   menuMoveUpColumn.Enabled := btnMoveUpColumn.Enabled;
   menuMoveDownColumn.Enabled := btnMoveDownColumn.Enabled;
+  listColumns.Invalidate;
 end;