[FIX] purchase: purchase_ok is already available in the view
[FIX] purchase: purchase_ok is already available in the view

`purchase_ok` is already in the view,
This field is already set in the view
`product.product_template_form_view`
and `account.product_template_form_view` inherits from this view.

Setting twice a field in a view prevents to correctly change
the field.

opw-641485

Elico-Corp/odoo_OCB,optima-ict/odoo,ygol/odoo,ygol/odoo,storm-computers/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,bplancher/odoo,syci/OCB,sysadminmatmoz/OCB,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,bplancher/odoo,storm-computers/odoo,tvtsoft/odoo8,bplancher/odoo,tvtsoft/odoo8,hip-odoo/odoo,laslabs/odoo,bplancher/odoo,sysadminmatmoz/OCB,mkieszek/odoo,mkieszek/odoo,sysadminmatmoz/OCB,optima-ict/odoo,microcom/odoo,stephen144/odoo,Elico-Corp/odoo_OCB,microcom/odoo,microcom/odoo,sysadminmatmoz/OCB,syci/OCB,laslabs/odoo,mkieszek/odoo,dfang/odoo,stephen144/odoo,mkieszek/odoo,syci/OCB,stephen144/odoo,dfang/odoo,microcom/odoo,storm-computers/odoo,dfang/odoo,ygol/odoo,optima-ict/odoo,ygol/odoo,ygol/odoo,dfang/odoo,tvtsoft/odoo8,stephen144/odoo,stephen144/odoo,dfang/odoo,optima-ict/odoo,optima-ict/odoo,ygol/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,storm-computers/odoo,syci/OCB,bplancher/odoo,laslabs/odoo,syci/OCB,laslabs/odoo,dfang/odoo,hip-odoo/odoo,laslabs/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,syci/OCB,microcom/odoo,tvtsoft/odoo8,microcom/odoo,optima-ict/odoo,sysadminmatmoz/OCB,mkieszek/odoo,storm-computers/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,stephen144/odoo,hip-odoo/odoo,laslabs/odoo,bplancher/odoo,tvtsoft/odoo8,tvtsoft/odoo8,mkieszek/odoo,ygol/odoo