PITTSBURGH — A road trip that started so promisingly for the Twins ended with a thud Sunday. The Twins began their trip by sweeping the Boston Red Sox at Fenway Park for the first time since 1994. They ended it by getting swept by the Pittsburgh Pirates, losing Sunday 9-3 at PNC Park. In the middle, they dropped three of four to the Chicago White Sox. They finished 4-6 on their 10-day trip — which matches their longest of the season — dropping t…