An ex-insurance adjuster who helped a former Rhode Island radio personality file a bogus home insurance claim last year pleaded guilty on Tuesday to his role in the scheme. In a deal with prosecutors, Vincent DiPaolo, 62, of Johnston, admitted to one count of conspiracy and four counts of mail fraud. He left the U.S. District Court in Providence without commenting. He’s the last defendant to plead guilty in the case, which was uncovered by investigators probing a separate shakedown of developers by town officials in North Providence.