A disgruntled customer got the go-ahead to pursue his claim that the manufacturer of a cooking spray that contains no butter engaged in false advertising by naming its product “Butter No-Stick Spray.”In a written opinion, U.S. District Judge Steven C. Seeger of the Northern District of Illinois did not rule on the merits of plaintiff Charles Strow’s contention that B&G Foods Inc. — which manufactures and sells the spray under the Crisco brand — engaged in consumer fraud, made negligent …