sort in ascending order by default, when changing sort order

src/pfwbged/collection/pfwbcollection.js

@@ -180,6 +180,7 @@
                     /* same column, reverse */
                     $('#sort_order').click();
                 } else {
+                    $('#sort_order').prop('checked', '');
                     $('#sort_on').val(sort_on);
                 }
                 $.querywidget.updateSearch();