fix(closure_tree/numeric_order_support.rb): fix order by clause to use the fully qualified column name

Author: Eliezer Reis

lib/closure_tree/numeric_order_support.rb

@@ -42,7 +42,7 @@ def reorder_with_parent_id(parent_id, minimum_sort_order_value = nil)
           UPDATE #{quoted_table_name}
           SET #{quoted_order_column(false)} = t.seq + #{minimum_sort_order_value.to_i - 1}
           FROM (
-            SELECT #{quoted_id_column_name} AS id, row_number() OVER(ORDER BY #{order_by}) AS seq
+            SELECT #{quoted_id_column_name} AS id, row_number() OVER(ORDER BY #{fully_qualified_order_by}) AS seq
             FROM #{quoted_table_name}
             WHERE #{where_eq(parent_column_name, parent_id)} #{min_where}
           ) AS t