[FIX] website_sale: fix order for the pager in front end.

In psql, use LIMIT and OFFSET together without a fully specified and uniq sort order
will generate unexpected behaviour.

Eg:
> id   id_dept  name
> -------------------
> 1    1        Tom
> 2    1        Mike
> 3    2        Meggie
> 4    2        Marge
> 5    3        Bart
> 6    3        Lisa

> using LIMITed selects like:

>    SELECT * FROM employee ORDER BY id_dept LIMIT 3
>    SELECT * FROM employee ORDER BY id_dept LIMIT 3 OFFSET 3
>    SELECT * FROM employee ORDER BY id_dept LIMIT 3 OFFSET 6

> You can have some result missings from the 3 requests, and others duplicated.
> Because id_dept is not a uniq order.

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