Fix eslint errors

modules/UI/invite/Invite.js

             this.setLockedFromElsewhere(locked);
         });
 
-        this.conference.on(ConferenceEvents.USER_ROLE_CHANGED, (id, role) => {
+        this.conference.on(ConferenceEvents.USER_ROLE_CHANGED, (id) => {
             if (APP.conference.isLocalId(id)
                     && this.isModerator !== this.conference.isModerator) {
 

modules/UI/side_pannels/contactlist/ContactListView.js

      * Setup listeners
      */
     registerListeners() {
-        let model = this.model;
         let removeContact = this.onRemoveContact.bind(this);
         let changeAvatar = this.changeUserAvatar.bind(this);
         let displayNameChange = this.onDisplayNameChange.bind(this);