LOS ANGELES It's the year for horror and “ The Conjuring : Last Rites” was no exception. Its opening weekend tipped the genre over $1 billion in earnings for this year's domestic box office . The horror sequel raked in $83 million domestically in 3,802 theaters, making it the third-highest domestic opening for a horror movie , behind “It” and “It: Chapter Two.” It's now the largest horror opening internationally, with $104 million in earnings outside of North American theaters. The film also