AL Franken says 20,000 poor kids and old people weren't the only victims of an exec who allegedly arranged a Bronx charity's mega-buck "loan" to Air America. "About three weeks into the life of Air America, I became an involuntary investor — I stopped being paid," Franken told listeners yesterday on WLIB (1190 AM). It was the first time the all-liberal network's biggest star addressed at length a controversial $875,000 loan from the disgraced — and now de-funded — Gloria Wise Boys & Girls Club. Since The Post first reported the story on July 30, Attorney General Eliot Spitzer announced...