Fix ordering by attribute and related attributes

This fixes sorting by attributes
which data type do not use value_sortable field.

This includes attribute of type currency, file size,
floor plan, geocode, integer, length, time code, weight,
and also date range in older versions of Providence.

app/lib/BaseFindEngine.php

@@ -734,7 +734,7 @@ private function _sortByAttribute($t_table, string $hit_table, ?string $element_
 					FROM ca_attribute_values cav FORCE INDEX(i_sorting)
 					INNER JOIN {$attr_tmp_table} AS attr_tmp ON attr_tmp.attribute_id = cav.attribute_id
 					WHERE cav.element_id = ? 
-					ORDER BY cav.value_sortable {$direction}
+					ORDER BY cav.{$attr_val_sort_field} {$direction}
 					{$limit_sql}";
 
 		$qr_sort = $this->db->query($sql, [$element_id]);
@@ -873,7 +873,7 @@ private function _sortByRelatedAttribute($t_table, $t_rel_table, string $hit_tab
 					INNER JOIN {$hit_table} AS ht ON ht.row_id = t.{$table_pk}
 					{$filter_join}
 					WHERE cav.element_id = ? {$filter_where}
-					ORDER BY cav.value_sortable {$direction}
+					ORDER BY cav.{$attr_val_sort_field} {$direction}
 					{$limit_sql}"; 
 		$qr_sort = $this->db->query($sql, [$element_id]);
 		$sort_keys = [];