remove knob disable logic, no need for it...

app.html

@@ -103,7 +103,6 @@
                 document.getElementById("download_svg").addEventListener("click", download_svg);
                 document.getElementById("show_citation").addEventListener("click", () => document.getElementById("citation").showModal());
                 document.getElementById("close_citation").addEventListener("click", () => document.getElementById("citation").close());
-                document.getElementById("penton_fiber_toggle").addEventListener("change", (e) => (document.getElementById("knob_toggle").disabled = !e.target.checked));
                 update();
             };
         </script>