California Gov. Gavin Newsom (D.) has come under fire for allegedly pushing to exempt a chain of restaurant franchises owned by one of his most generous donors from the state’s new minimum wage law. The fast-food wage law, which will raise California’s minimum wage at fast-food chains from $16 to $20 an hour starting in April, comes with an exemption for restaurants that bake and sell bread, which would include the two dozen Panera Bread locati…