There’s something so adorably nerdy about the fact “The Last Witch Hunter” is partly based on one of Vin Diesel’s old Dungeons & Dragons characters that it’s hard not to look kindly on this good old fashioned pulpy B-movie. In the Middle Ages, a band of warriors enters the lair of the Witch Queen (Julie Engelbrecht), determined to put an end to her malevolent magic which is blighting the human…