Directed by Adam Shankman, “Stop! That! Train!” aims to give viewers comic relief at a time when Pride celebrations have become a culture war flashpoint. “ RuPaul’s Drag Race ” veterans Ginger Minj and Jujubee make a convincing bid for big-screen stardom in “Stop! That! Train!,” a disaster comedy that’s poised to be a cinematic highlight for legions of LGBTQ+ Pride Month revelers. The queens are also hopeful the movie, which hit theaters Friday, gives viewers comic relief at a time when Pride