A federal appeals court on Tuesday revived a class-action lawsuit accusing Pfizer Inc of causing tens of billions of dollars of losses for shareholders by misleading them about the safety of its Celebrex and Bextra pain-relieving drugs. By a 3-0 vote, the 2nd U.S. Circuit Court of Appeals in Manhattan said U.S. District Judge Laura Taylor Swain erred in dismissing the case after preventing …