If you want to know how big an upgrade the “M3GAN” sequel has on the original, look no further than the very first scene. “M3GAN” was mostly set in a Seattle house, but “M3GAN 2.0” starts at the Turkish-Iranian border — with a murderous rampage in a secret military installation and the presence of Saudi intelligence, with U.S. Defense Department officials covertly watching. Two hours later, it's not clear if this is really an upgrade.