The U.S. Drug Enforcement Administration is allowing one of the nation’s largest wholesale drug distributors to stay in business, reversing an earlier order stripping the company of its licenses for its failure to properly monitor the shipment of tens of millions of addictive painkillers blamed for fueling the opioid crisis.As part of the settlement announced Wednesday, Morris & Dickson Co. agreed to admit wrongdoing, comply with heightened reporting requirements and surrender one of its two certificates of …