By SARA LEPRO Gold prices closed slightly higher Friday, finishing the week with a gain amid signs that a drop in consumer prices is moderating.Energy and agriculture futures retreated.The Labor Department said consumer prices were flat in April after dipping 0.1 percent in March. While the improvement was modest, it did ease some of the market's concerns about rapidly falling prices, or deflation.Investors are mindful that as the economy improves, buoyed by the government's massive stimulus efforts and the steady flow of money into the financial system, inflation could reignite.