utils/events: fix events.on IE8 workaround
utils/events: fix events.on IE8 workaround

bios21/interact.js,bios21/interact.js,taye/interact.js,adamgruber/interact.js,taye/interact.js,adamgruber/interact.js,taye/interact.js,Endika/interact.js,Endika/interact.js,marian-r/interact.js,marian-r/interact.js