Fix face normal correction not being applied with bowyer-watson method

Author: CptWesley

src/ObjObject.cs

@@ -151,7 +151,10 @@ private static Face[] CreateFaces(Vertex[] vertices, ClippingPlane[] planes)
                     return null;
 
                 foreach (Face face in BowyerWatson(verts))
+                {
+                    FixNormal(face, planes[i].Normal);
                     faces.Add(face);
+                }
             }
 
             return faces.ToArray();