After his death, Toby Keith had the best week of his career on the Billboard Digital Song Sales chart last week.His songs "Don't Let the Old Man In," "Should've Been a Cowboy," "Courtesy of the Red, White & Blue," "How Do You Like Me Now?!," "As Good as I Once Was," "American Soldier," "I Love This Bar" and "Beer for My Horses," are all selling huge on the all genre chart.On top of that, he…