Patrick Hipes Executive Managing EditorA trio of shows on a trio of networks shared top honors in Friday’s broadcast primetime ratings, with Fox airing the fall premiere of WWE SmackDown, NBC showing Game 4 of the Stanley Cup Finals and ABC a fresh 20/20.Fox, NBC and ABC tied for the nightly win in the demo, while ABC was the night’s most-watched network behind a repeat of America’s Funniest Home Videos leading into 20/20, which drew a 0.5 rating in the adults 18-49 demographic and 3.82 million