fix issue with nickname input in chat

app.js

     APP.UI.addListener(UIEvents.NICKNAME_CHANGED, function (nickname) {
         APP.settings.setDisplayName(nickname);
         room.setDisplayName(nickname);
+        APP.UI.changeDisplayName(APP.conference.localId, nickname);
     });
 
     room.on(ConferenceErrors.CONNECTION_ERROR, function () {

modules/UI/UI.js

     ContactList.onDisplayNameChange(id, displayName);
     SettingsMenu.onDisplayNameChange(id, displayName);
     VideoLayout.onDisplayNameChanged(id, displayName);
+
+    if (APP.conference.isLocalId(id)) {
+        Chat.setChatConversationMode(!!displayName);
+    }
 };
 
 UI.initConference = function () {

modules/UI/side_pannels/chat/Chat.js

                 event.preventDefault();
                 var val = UIUtil.escapeHtml(this.value);
                 this.value = '';
-                if (APP.settings.getDisplayName()) {
-                    eventEmitter.emit(UIEvents.NICKNAME_CHANGED, val);
-                    return;
-                }
+                eventEmitter.emit(UIEvents.NICKNAME_CHANGED, val);
             }
         });