Dennis Harvey Film CriticThere’s a whole lot of ammo going blammo over the course of “One Shot,” an action movie couched as a battle in real time between Navy SEALs and insurgents on a U.S.-controlled, Guantanamo-style island detention facility, presented in what appears to be a single, continuous shot.Of course, as in other recent films like “Birdman” and “1917,” the “real time” is an illusion created by hard-to-detect editing together of several long, elaborately blocked individual shots —