fix on change JavaScript event on color form field with layout advanced (joomla#41126)

Author: jurihahn

layouts/joomla/form/field/color/advanced.php

@@ -66,6 +66,7 @@
 $disabled = $disabled ? ' disabled' : '';
 $readonly = $readonly ? ' readonly' : '';
 $hint = strlen($hint) ? ' placeholder="' . $this->escape($hint) . '"' : ' placeholder="' . $placeholder . '"';
+$onchange = $onchange ? ' onchange="' . $onchange . '"' : '';
 $required = $required ? ' required' : '';
 $autocomplete = !empty($autocomplete) ? ' autocomplete="' . $autocomplete . '"' : '';