WOODLAND HILLS - As he launched a radio ad campaign Tuesday for his budget measures on the May 19 ballot, Gov. Arnold Schwarzenegger said failure to approve the package would worsen the state's already-dire fiscal crisis. "If they don't pass, we will be facing a $50 billion problem," Schwarzenegger said at a meeting with Daily News editors and reporters. "It will mean massive cuts in education, hospitals, prisons. These are things people don't want to see cut." Schwarzenegger's campaign committee, Budget Reform Now, began its advertising campaign Tuesday for the six ballot measures - Propositions 1A, 1B, 1C, 1D, 1E...