Do not generate a [reduce] visitor.

demos/basic/Term.ml

@@ -17,9 +17,6 @@ type ('bn, 'fn) term =
     visitors { variety = "endo"; public = ["visit_term"];
                ancestors = ["BindingForms.endo"] }
     ,
-    visitors { variety = "reduce"; public = ["visit_term"];
-               ancestors = ["BindingForms.reduce"] }
-    ,
     visitors { variety = "iter2"; public = ["visit_term"];
                ancestors = ["BindingForms.iter2"] }