SAN FRANCISCO — In a victory for free speech advocates, appellate judges have ruled that YouTube should not have been forced to take down an anti-Muslim film that sparked violence in the Middle East and death threats to actors.The 11-judge panel of the 9th U.S. Circuit Court of Appeal sided with Google, which owns YouTube, saying the previous decision by a three-member panel of the same court gave “short shrift” to the First Amendment and constituted prior restraint — a prohibition on free speech …