The Chicago City Council on Wednesday approved Mayor Lori E. Lightfoot’s pick for city corporation counsel and grumbled their way through a series of legal settlements.Former Holland & Knight partner Mark A. Flessner will lead the city’s Law Department, a role he has performed in an acting capacity since May. The aldermen showered Flessner with praise, making no mention of their own desires to have their own legal counsel — a conversation that dominated Flessner’s confirmation hearing on Monday …