Of course, “Game of Thrones” devotees have long been bowing down before this British actress and her impressive display of bewitching bad-assery as the silver-haired dragon-keeper Daenerys Targaryen. But she hasn’t quite broken through on the big screen yet. Instead, she proved all too capable of being as forgettable as anything else in last summer’s “Terminator Genisys” as the young Sarah Connor.