WASHINGTON — Need an elixir for a losing streak? How about something potent to stave off a late-season collapse? Book an appointment with the Washington Nationals. The Phillies couldn’t have timed it better. After scoring a total of three runs in three games this week in Chicago and pulling into town on a five-game skid, just a whiff of the air in the D.C. Navy Yard boosted their playoff odds. Heck, they didn’t even have to play particularly well, either. In the opener of a day-night doubleheader Friday, with the threat of rain looming, Rhys Hoskins smashed a first-inning home run that propell…
