[FIX] product, stock: set active field in default product view, instead of...

[FIX] product, stock: set active field in default product view, instead of inherited view of stock module

The active field was placed in the Delays section, which does not make sense
Besides, we should be able to disable products by default, not when stock is installed.

bzr revid: dle@openerp.com-20140408180920-jpl50ups6ro1z4qp