By Nabih Bulos Los Angeles Times BEIRUT — Thousands of foreign-born women left their homes and lives to join Islamic State and marry its fighters. But now that the militant group's so-called caliphate is reduced to crumbled masonry and scorched rebar, many of them want to return home. Shamima Begum was a teenage schoolgirl in east London when she left home to join Islamic State; Hoda Muthana, an Alabama-born