MINNEAPOLIS — Minnesota Republicans filed a lawsuit Monday to try to force a rerun of a state House race where the incumbent Democrat won by 14 votes — but in which investigators concluded that election workers probably destroyed 20 valid absentee ballots after failing to count them. It’s a race that could determine the balance of power in the Minnesota House, where leaders from both parties are working out the details of a power-sharing agreement that currently presumes a 67-67 tie when the Legislature convenes next month.