Fix line_item_spec
Fix line_item_spec

The expectation that the parts created would be in stock was failing.  I don't
know why this worked before or what changed to make it fail now.  Also not sure
if this is the best way to set up the parts to be "in stock".

surfdome/spree-product-assembly,tmedford/spree-product-assembly,surfdome/spree-product-assembly,spree-contrib/spree-product-assembly,helloluis/spree-product-assembly,kimquy/spree-product-assembly,cindyward1/spree-product-assembly,cindyward1/spree-product-assembly,spree-contrib/spree-product-assembly,surfdome/spree-product-assembly,groundctrl/spree-product-assembly,tmedford/spree-product-assembly,glossier/spree-product-assembly,romul/spree-product-assembly,BeDepraved/spree-product-assembly,agencyleroy/spree-product-assembly,groundctrl/spree-product-assembly,kimquy/spree-product-assembly,cindyward1/spree-product-assembly,groundctrl/spree-product-assembly,helloluis/spree-product-assembly,BeDepraved/spree-product-assembly,BeDepraved/spree-product-assembly,kimquy/spree-product-assembly,glossier/spree-product-assembly,helloluis/spree-product-assembly,spree-contrib/spree-product-assembly,tmedford/spree-product-assembly,romul/spree-product-assembly,glossier/spree-product-assembly,reinaris/spree-product-assembly,agencyleroy/spree-product-assembly,reinaris/spree-product-assembly,romul/spree-product-assembly,reinaris/spree-product-assembly,agencyleroy/spree-product-assembly