Citigroup (C) is cutting another 300 trading and sales positions this year as it continues to rein in costs. The No. 3 U.S. bank by deposits also agreed to pay $360 million to settle a dispute over $1 billion in collateral that investment bank Lehman Bros. deposited in the days leading up to its bankruptcy and collapse. The Wall Street Journal first reported on the job cuts, citing sources briefed on the efforts. The reductions follow 900