Alarmed by the shifting vote tallies that have turned Charlie Rangel’s apparent reelection into a court battle, legislative leaders say they want to fix the way city votes are counted. The operation needs to be totally computerized, rather than having a bungle-prone process that requires the city Board of Elections to count paper ballots by hand, said Assembly Speaker Sheldon Silver (D-Manhattan). “That should definitely be something they do — just collect all the flash drives (from the voting machines) and bring them to [BOE] headquarters,” Silver said. “I don’t think you’ll change the outcomes as a result, but you’ll certainly know the results faster.”