Actress Angela Lansbury has received her first college degree, an honorary doctorate of humane letters from Boston University. "I never went to college," the star of television's "Murder, She Wrote" said after receiving her degree Sunday. "I left school at 12 for acting classes and I've been in the theater ever since.". . . Vanna White, of Wheel of Fortune fame, will turn her T-A-L-E-N-T-S to the Home Shopping Network on Tuesday morning. Vanna will be hawking bedding and household accessories . . . and you guessed it, they're calling it a "White Sale."