apps/federatedfilesharing/js/settings-admin.js
$(document).ready(function() {
$('#fileSharingSettings input').change(function() {
var value = 'no';
if (this.checked) {
value = 'yes';
}
var app = (this.id !== 'autoAcceptTrusted') ? 'files_sharing' : 'federatedfilesharing';
OC.AppConfig.setValue(app, $(this).attr('name'), value);
});
});