Make Torch UI remember its last screen size/position. Fixes #260

(this is Jim's fault)

Torch.Server/Views/TorchUI.xaml.cs

@@ -102,6 +102,8 @@ namespace Torch.Server
             var newPos = new Point((int)Left, (int)Top);
             _config.WindowPosition = newPos;
 
+            _config.Save(); //you idiot
+
             if (_server?.State == ServerState.Running)
                 _server.Stop();