LAST MAN STANDING - "Ding Dong Ditch" - The Baxters are constantly awakened by an early morning prankster who rings their doorbell and then runs away. When Mike catches the teen-aged boy, the kid injures himself and now his litigious father expects Mike to pay the doctor bill. Also, single working mom Kristin starts college, on "Last Man Standing," TUESDAY, FEBRUARY 28 (8:00-8:30 p.m., ET) on the ABC Television Network. (ABC/CARIN BAER) TIM ALLEN, URIAH SHELTON, NANCY TRAVIS