[FIX] purchase: default picking_type_id with ir.values

The deleted code put the same picking_type_id for all companies.
The function _get_picking_in returns the right default picking_type_id
according to the company.

Steps to reproduce:
-stock.warehouse0 is on company A.
-Define another company B with its own warehouse.
-Update the purchase module -> a new default value for picking_type_id on purchase
order for company B is created wtih the value of company A
-Create a purchase order on company B, Odoo tries to get the picking_type_id from company A.
If user doesn't have any rights on company A, it occurs a security warning.
Otherwise the purchase order is linked to a picking operation of another company.

opw:694059

addons/purchase/purchase_data.yml

@@ -1,7 +1,3 @@
--
-  !python {model: ir.values}: |
-    whr = self.pool.get('stock.warehouse').browse(cr, uid, ref('stock.warehouse0'), context=context)
-    self.set_default(cr, uid, 'purchase.order', 'picking_type_id', whr.in_type_id.id, for_all_users=True, company_id=True, condition=False)
 -
   !python {model: stock.warehouse}: |
     #enable purchase on main warehouse