Gov. Brian Kemp’s administration went to court Thursday seeking to block Atlanta from enacting coronavirus restrictions and requiring residents to wear masks, setting up a legal showdown between the state and local governments over efforts to contain the disease. The state filed a lawsuit challenging Atlanta Mayor Keisha Lance Bottoms’ July 10 decision to revert to “phase one” guidelines that push restaurants to close dining rooms and urge residents to leave home only for essential trips. It also casts the city’s new mask requirements as “void and unenforceable.”