There’s a lot of snickering over the casting of Jason “Gummy Bear” Davis in Bravo’s “The Millionaire Matchmaker” airing tonight. “They must be desperate,” laughed one source. While his late grandfather, Marvin Davis, was a billionaire who once owned 20th Century Fox, the Beverly Hills Hotel and the Denver Broncos, Jason recently got an eviction notice on his $3,600-a-month LA apartment for nonpayment of rent. Asked for comment, Davis said, “Tell my fans and haters they are all welcome to join me at Capitol City Hollywood to view the episode.”