SACRAMENTO, Calif. — California Gov. Gavin Newsom’s administration has denied a news report that he pushed for an exception to the state’s new fast-food minimum wage law that benefits a wealthy campaign donor.California’s minimum wage is $16 per hour. But starting April 1, most fast-food restaurants in the state must pay their workers at least $20 an hour under legislation Newsom signed last year to much fanfare. It doesn’t apply to restaurants that have on-site bakeries and sell bread as a…