Revision 1778421

Fixed: Refactor ContentWorkerInterface methods signatures
(OFBIZ-9164)

Fixes an issue in the ShowCartItems.ftl file reported by Deepak 

Actually I was overzealous with this.
Reverting a simple change were I changed a parameter in the signature 
of the protected ShoppingCartItem() method from 
ShoppingCart.ShoppingCartItemGroup to ShoppingCartItemGroup 
should be enough

Thanks: Deepak for report