DETROIT — Michigan Supreme Court justices will decide whether there’s enough proof that Michigan’s new redistricting maps give Black voters a fair shot at electing preferred candidates — a conclusion that hinges on whether the state can still elect candidates of color without decades-old majority-minority districts in Detroit. The Detroit Caucus that’s challenging the state’s new political maps argued Wednesday that Black voters won’t be able to get a preferred candidate through primary elections if their voice is diluted by White Democratic voters in the suburbs. Michigan’s Independent Citize…