It was finally extinguished. After four weeks at No. 1, “Avatar: Fire and Ash” was dethroned at last — with “28 Years Later: The Bone Temple” jumping into first place on its opening day. On Friday, the post-apocalyptic horror, which The Post called , a “twisted, more brutal and freakishly funny continuation” of its predecessor, last year’s “28 Years Later,” raked in $5.5 million, according to The Numbers . The fourth installment of the “28 Days Later” franchise has Ralph Fiennes reprising his