BROADCAST FINALS ABC:  SHARK TANK gained 0.03 to 0.60, but 20/20 fell 0.18 to 0.31. CBS:  Back from a rerun week,  SWAT rose 0.03 to 0.49, MAGNUM PI held at 0.43, and BLUE BLOODS was steady at 0.46. NBC:  HOME SWEET ...