Mark Cuban didn’t want to talk during his visit to Wrigley Field on Wednesday. Talk about trying to win over Major League Baseball. ‘‘I’m here as a Cubs fan,’‘ Cuban said, waving off a group of reporters as he took his front-row seat — one chair from the Cubs’ dugout — before their game against the Milwaukee Brewers. ‘‘How can I enjoy my beer if you guys are around?’‘... t’s no secret Cuban is among the six to 10 groups ready to make a formal bid for the Cubs, who have been put on the block by Tribune chairman and CEO Sam Zell.