While there is still time, someone might want to give Tucker Carlson's booking team a call. Based on how 20/20 (0.8/3) stumbled last night with a sit-down and catch-up interview with Caitlyn Jenner, the Fox News Channel host may find his April 24 debut in Bill O'Reilly's old time slot proving less than golden with the former Olympian as a guest. Two years after Diane Sawyer's ratings multi-year record breaking chat with the transitioning 1976 decathlete and reality TV…