Mother-son dinner date! On Friday, July 12, Angelina Jolie and her son Pax, 20, were spotted at the popular celebrity eatery Sushi Park in West Hollywood, Calif., following a stressful week regarding the actress’ legal battle with ex Brad Pitt. The 49-year-old stepped out in an all-black outfit, wearing a dress, heels and a handbag. Meanwhile, Pax wore a blue jacket, white shirt and khaki pants as he and his mom smiled entering the restaurant. It appeared that the Girl, Interrupted star’s offspring, footed the bill for the night as he was spotted taking out his card to pay for parking. As OK! …