nice-select restore to working
nice-select restore to working

I accidently committed a breaking change in https://github.com/ether/etherpad-lite/commits/1b8cd0747dc76b7a46f7e00201b2b73b1591e456/src/static/js/vendors/nice-select.js

ether/etherpad-lite,ether/etherpad-lite,storytouch/etherpad-lite,storytouch/etherpad-lite,storytouch/etherpad-lite,ether/etherpad-lite