PHILADELPHIA — The teen who shot four people including a SEPTA police officer in a standoff Wednesday was shot and killed by police, not by a self-inflicted gunshot wound as police initially reported, department officials said Friday. Zyhiem Terrell-Hartman, 18, was fatally shot by police after barricading himself inside a Frankford apartment and shooting at officers from a second-story window for nearly 90 minutes, police said. “No, it wasn’t suicide. We shot him,” said a high-ranking law enforcement official who asked not to be identified because he was not authorized to speak publicly about…