def_visibility + reactive map buttons

src/client/html_post.ml

@@ -144,7 +144,7 @@ let post_menu t_s post =
            | None -> false
            | Some u -> String.equal u.user_id post.poster_id )
     in
-    def_on own_post delete;
+    def_visibility `On own_post delete;
     [ delete; report ]
   in
   Html_util.mk_dropdown_menu ~class_prefix:"post-info" ~label:""