Republican Nan Hayworth last week sank $1 million of her own money into her bid to win back New York’s 18th Congressional District seat, erasing a funding gap as her rematch against Rep. Sean Patrick Maloney enters the homestretch.Federal Election Commission campaign filings show the Westchester County eye doctor already had loaned or given her campaign around $700,000 since the last election, and made her latest, jumbo investment on Tuesday.