BALTIMORE — The Atlanta Braves are finding absolutely no margin for error during a slump that is threatening to render the last two months of the season meaningless. Right-hander Mike Foltynewicz held his own in a matchup with Orioles ace Chris Tillman on Wednesday night, except for two pitches that made the difference in Baltimore’s 2-0 victory. Home runs by Jonathan Schoop and J.J. Hardy were enough to enable the Orioles to complete their first three-game sweep of the Braves since 1999.