Rebel Wilson is going to have to prove in court that she wasn’t making up the appalling allegations she made against producers on her film “The Deb,” a judge ruled on Wednesday. The “Pitch Perfect” star had claimed on social media that the movie’s co-producer Amanda Ghost had sexually assaulted its star, Charlotte MacIness, and that her fellow execs Gregor Cameron and Vince Holden had “embezzled funds from the film’s budget.” Wilson tried to get their suit thrown out earlier this year, but a court sided with Ghost, Cameron and Holden and let it stand. Wilson appealed that decision, but the appeals court once again sided with her adversaries. Rebel Wilson lost her bid to get defamation case against her thrown out. BIANCA DE MARCHI/EPA/Shutterstock Wilson accused Amanda Ghost of sexually assaulting “The Deb” star Charlotte MacInnes (pictured). Getty Images Wilson will now have to prove that her allegations against the trio weren’t malicious lies, we’re told.…