Jacqueline Kennedy Onassis’s $100 million estate is worth a bit more — $99 more, to be exact. She was entitled to excess workers’ compensation premiums when she died in 1994. The $99, which had been paid to cover Mrs. Onassis’s household help, will be returned to her estate, said attorney Alex Forger. The missing money came to light last week when a list published in New York’s Daily News’ classified section named people owed money by Boston-based Liberty Mutual Insurance. Included was the entry: “Onassis, Jacqueline, 1040 Fifth Ave.” If the money had gone unclaimed, it would have reverted to the state.