AT THE MOVIES, Pacific Heights, starring Michael Keaton, rises to the top despite a paltry $6.9 million opening. ON TV, more than 31 million viewers yuk it up for the week’s most-watched shows, ABC’s America’s Funniest Home Videos and America’s Funniest People. IN MUSIC, M.C. Hammer’s (left) Please Hammer Don’t Hurt ‘Em nails No. 1 on the Billboard album chart. AND IN THE NEWS, two months after Iraq invaded Kuwait, Soviet president Mikhail Gorbachev declines to send troops to join the American-led multinational force in the Persian Gulf, saying he doubts a war will occur.