There's a new toque at the head of one of D.C.'s last fine dining kitchens, and he's not exactly new to the area. 1789 Restaurant — the longtime Georgetown restaurant that's part of the Clyde's Restaurant Group — has hired Samuel Kim as its new executive chef, bringing the chef back after eight years working in New York City. Kim most recently served as executive sous chef at Colicchio and Sons, but he began his culinary career at 1789 under the direction of then-executive chef Ris Lacoste…