LONDON — Writer Shehan Karunatilaka won the prestigious Booker Prize for fiction on Monday for “The Seven Moons of Maali Almeida,” a satirical “afterlife noir” set during Sri Lanka’s brutal civil war. The 47-year-old, who has also written journalism, children’s books, screenplays and rock songs, is the second Sri Lanka-born Booker Prize winner, after Michael Ondaatje, who took the trophy …