Fix a test

One cannot run `make_mesh_3` without `no_exude()`, and then use
`verify_c3t3`, that runs `refine_mesh_3`.

Mesh_3/test/Mesh_3/test_meshing_3D_gray_image.cpp

@@ -100,6 +100,8 @@ public:
 
     // Mesh generation
     C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria,
+                                        no_perturb(),
+                                        no_exude(),
       mesh_3_options(number_of_initial_points = 30));
 
     // Verify