Claressa Shields says her fight with Maricela Cornejo will be a “throw-down in Motown” in Detroit on Saturday. Shields, 28, defends her WBO, WBC and WBA middleweight titles and her undefeated record against her fellow American at the Little Ceasars Arena. Detroit is home to the famous Motown recording studios. “I know she [Cornejo] said she wants to go out there and dance, but you’re going to be dancing by yourself because I came to fight,” said Shields. “It’s going be a real throw-down in Motown.” Cornejo, 36, has 16 wins and five defeats on her record and stepped in…