MIAMI — A Florida appeals court has overturned the conviction of a former North Miami police officer who was convicted for shooting at an autistic man holding a silver toy truck, a case that drew national headlines. The Third District Court of Appeals on Wednesday overturned the misdemeanor culpable negligence conviction for Jonathon Aledda, who claimed he believed the man was holding a firearm and holding another man hostage during a standoff in July 2016. The Miami-Dade State Attorney’s Office must now decide if it will re-try Aledda, who was fired from the police department after the shooti…