With typical modesty, Lew Klein downplayed his contributions to the broadcast world over 60 years — including his work on Sally Starr's show, "Romper Room," and "American Bandstand." Last week, in his 58th year as an adjunct professor at Temple, he was the center of attention at the 10th annual Alumni in the Media Awards that bear his name. He shifted credit to Walter and Leonore Annenberg and Gerry and Marguerite Lenfest, who each gave $250,000 a decade ago to endow a scholarship in Klein's name, and to publisher Kal Rudman.