MADRID — A leading Spanish museum said Friday it’s confident that U.S. courts will again rule that a valuable French impressionist painting once taken from a Jewish family by the Nazis belongs to the museum, and not to descendants of the family. In a statement Friday, the Thyssen-Bornemisza National Museum said that despite a new U.S. Supreme Court ruling that returned the case to lower courts, it was sure those courts would once again rule that Spanish law, rather than California law, should prevail. That would mean the painting, Camille Pissaro’s “Rue Saint-Honoré in the Afternoon, Effect of Rain,” should...