Joe Otterson TV ReporterChloe Bennet has stepped down as one of the three leads in the live-action CW pilot based on “The Powerpuff Girls,” Variety has learned exclusively.Bennet was set to star as Blossom in the pilot, which is currently titled “Powerpuff.” The show was originally in contention during pilot season earlier this year for a potential fall air date, but The CW made the decision to redevelop and reshoot it instead, with CW chairman and CEO Mark Pedowitz calling the first pilot “a