The 2024 Fiat 500e returns to the U.S. in March to relaunch the brand, and this time Fiat is all about EVs—and keeping the 500 lineup as a two-door icon. As Fiat has already said in various ways over the past couple years, the U.S.-bound 500e will stand on its own. It won’t be a loss-leader for the brand, or $49-a-month EV lease deal…