FanDuel CEO Amy Howe participates in the Semafor World Economy conference in Washington, D.C. REUTERS FanDuel CEO Amy Howe has been shown the door after five years with the company.  Company president Christian Genetski is set to take over her post in leading the nation’s largest sportsbook.  Howe guided FanDuel through a period of rapid growth as sports betting and online gambling expanded across numerous U.S. states. FanDuel will pay Howe $4.37 million in severance — more than four times her base salary — representing two years’ worth of combined base pay and target annual bonus. The leadership shakeup comes as shares of FanDuel’s parent company, Flutter, dropped 2.5 percent in Wednesday afternoon trading.…