The Champ: PITFALL (LA) Is there some sort of implied vaginal metaphor in that title? I’ll guess leave that to the college set to figure. The “pitfall” in question is sultry, whisky-voiced Lizabeth Scott and Dick Powell is the middle-aged everyman who falls for her. The plot follows an insurance investigator (Powell) who feels trapped in his regimented, predictable and unchanging life, until an…