MALIBU, Calif.—An injured pygmy sperm whale that was initially rescued by Los Angeles County lifeguards and firefighters at a Malibu beach ultimately had to be euthanized, wildlife officials said Monday. Lifeguards were called about the beached whale at Malibu Surfrider Beach, in the 23000 block of Pacific Coast Highway, around 4:40 p.m. Sunday, according LA…