On the reality television show “The Hills,” Spencer Pratt played something of a villain, blamed for spreading a salacious rumor and driving a wedge between his girlfriend and her best friend. Pratt is casting himself as a hero in his latest venture, a bid to be mayor of Los Angeles, in which he’s promising to rid the nation’s second most populous city of disorder and dysfunction. Originally greeted with bemusement, Pratt is now upending the race with early voting underway ahead of the June 2