TALK about torture. Blender magazine editors chose Starship's 1985 hit "We Built This City" as the worst song of all time. Now they've assigned contributor Russ Heller to set a world record for repeatedly listening to the worst song ever. He'll sit in a plexiglass booth at the Best Buy in NoHo starting Friday at 8 a.m. and grit his teeth as "We Built This City" is played at least 324 times over a grueling 24 hours