The $106 billion war supplemental bill President Barack Obama signed yesterday will start closing the pay gap between Foreign Service officers in Washington and overseas beginning this fiscal year. The bill for the first time authorizes diplomats abroad to receive the same 23.1 percent locality payment they would receive if they were stationed in the Washington area. The bill does not spell out how much the State Department and other foreign affairs agencies such as the Agency for International Development should pay Foreign Service officers this year. The American Foreign Service Association suggested closing the gap by one-third — or…