ST. LOUIS — The Astros are going backward heading into the All-Star break. Bo Porter’s team has lost four of five games and is just 4-12 during its last 16 contests, prior to a 7:15 p.m. CT matchup against the Cardinals at Busch Stadium. Wednesday’s game is the Astros’ final road interleague contest this season. Astros righthander Jordan Lyles (4-3, 3.87 ERA) is set to face Cardinals righty Shelby Miller (9-6, 2.80). Lyles, 22, has posted a 2.83 ERA during his last 10 starts. Two rough outings in late June were followed by an improved start last Thursday against Tampa Bay, when he allowed two runs in 6 2/3 innings. [...]