fixed rendering bug in planarization example

Former-commit-id: 8464382de8f96451a4784d31dbd80174282a6de7

tutorial/509_Planarization/main.cpp

@@ -108,6 +108,7 @@ int main(int argc, char *argv[])
   igl::Viewer viewer;
   key_down(viewer,'2',0);
   viewer.core.invert_normals = true;
+  viewer.core.show_lines = false;
   viewer.callback_key_down = &key_down;
   viewer.launch();
 }

tutorial/images/509_Planarization.png.REMOVED.git-id

@@ -1 +1 @@
-c63f0e533d60258edf823f524c9fdedf29a53b9d
+10b1d8bda9486dcbbbf6d8e04aa00edfa25de838