AT&T (NYSE: T) claimed victory in court on Tuesday, but on Wednesday shares fell, and the company suffered another downgrade as concerns persist about future growth. Analysts at MoffettNathanson downgraded the stock to “sell” from “neutral” and gave it a price target of $28 in a new research note Wednesday. They said the company, which got the green light to acquire Time Warner (NYSE: TWX) Tuesday, will assume a lot of debt, and the company is struggling with growth in many of its traditional…