Also convert ES6 to ES5 syntax while we're at it. Fixes: #5476 Fixes: 5b42cd5b46 ("luci-mod-system: move default option from defaul-on trigger to none trigger") Signed-off-by: Jo-Philipp Wich <jo@mein.io> (cherry picked from commit fceabd74465f2aafc40edc084429f30837deff2c)