fix #13 - typo

app/views/tfa/create_webauthn.html.erb

@@ -22,7 +22,7 @@ var options = <%= @options.to_json.html_safe %>
 function do_register() {
   options.challenge = str2ab(options.challenge);
   for (var i = 0; i < options.excludeCredentials.length; i++) {
-    options.excludCredentials[i].id = str2ab(options.excludeCredentials[i].id);
+    options.excludeCredentials[i].id = str2ab(options.excludeCredentials[i].id);
   }
   options.user.id = str2ab(options.user.id);