David Ayer who? If you’re the folks at Warner Bros. and DC Films, that’s the exact question they want audiences to ask after seeing James Gunn’s latest film, “The Suicide Squad.” Though Ayer did, technically, make a “Suicide Squad” film back in 2016 (though it might not conform to his exact vision), the studio behind that feature is hoping you have selective amnesia and embrace what is happening in Gunn’s reinvention of the misfit supervillain troupe, Task Force X.