Voters will decide on Tuesday whether Suffolk will continue to have both a county treasurer and a county comptroller. Both are elected positions. This should settle a lengthy dispute between Angie Carpenter, the longtime treasurer, and County Executive Steve Bellone. Mr. Bellone has sought to eliminate the treasurer’s post to streamline government and reduce the cost to taxpayers by as much as $800,000 a year in departmental salaries and related expenses. If approved, the comptroller would assume the duties of the treasurer, which for the most part are paying the bills.