Man's best friend was saluted as one Bay Ridge's resident savior, as Lexi the bichon frise was honored at St. Patrick's Church yesterday. Last month, when Linda Deutsch was taking the 5-year-old dog for a walk, Lexi refused to go to the elevator and instead dragged Deutsche down the hall. It turned out that Lexi heard the cries of neighbor James Postler--an 85-year-old deacon at the church--who had fallen hours earlier and managed to crawled......