Revert "[FIX] product: respect sequence when loading pricelist rules"

This reverts commit b0f02e31b2.

As pointed out by @nim-odoo [1], a similar patch has already been
uncommited few month ago [2].

Ref #11988
opw-676422

[1] https://git.io/vrYxY
[2] see a6badd2559

addons/product/pricelist.py

@@ -156,7 +156,7 @@ class product_pricelist(osv.osv):
             'AND (categ_id IS NULL OR categ_id = any(%s)) '
             'AND (pricelist_id = %s) '
             'AND ((i.date_start IS NULL OR i.date_start<=%s) AND (i.date_end IS NULL OR i.date_end>=%s))'
-            'ORDER BY applied_on, sequence, min_quantity desc',
+            'ORDER BY applied_on, min_quantity desc',
             (prod_tmpl_ids, prod_ids, categ_ids, pricelist.id, date, date))
 
         item_ids = [x[0] for x in cr.fetchall()]