delete test hook

src/surface/sf_hull.scad

@@ -41,9 +41,4 @@ module sf_hull(points, thickness) {
     for(twintri = twintri_lt) {
         tri_to_hull_faces(twintri[0], twintri[1]);
     }  
-}
-
-// override it to test
-module test_function_grapher_faces(points, faces) {
-
 }