OMGPOP has had a rough life under Zynga's wing -- the startup fell from grace as it became clear that Draw Something was more a one-hit wonder than a sustainable profit engine. It makes sense, then, that Zynga is continuing its cost-cutting spree with plans to close OMGPOP's less successful web portal. The shutdown will start with four of OMGPOP's web games, which stop running on August 29th. OMGPOP.com will go dark a month later, on