The stars were out in Boston Monday despite the morning MBTA bus accident that injured more than a dozen people around the Dudley Square set of the new Boston comedy “The Heat.” “Bridesmaids” actress Melissa McCarthy — who stars opposite Sandra Bullock in the Paul Feig film — was out in Dudley Monday afternoon wearing a lovely Pawtucket T-shirt for the shoot. The movie has been based at the old District B-2 police station.