fix: Show audio/video options on lobby screen

react/features/conference/components/web/Conference.js

 import { Filmstrip } from '../../../filmstrip';
 import { CalleeInfoContainer } from '../../../invite';
 import { LargeVideo } from '../../../large-video';
-import { KnockingParticipantList } from '../../../lobby';
+import { KnockingParticipantList, LobbyScreen } from '../../../lobby';
 import { Prejoin, isPrejoinPageVisible } from '../../../prejoin';
 import {
     Toolbox,
      */
     _iAmRecorder: boolean,
 
+    /**
+     * Returns true if the 'lobby screen' is visible.
+     */
+    _isLobbyScreenVisible: boolean,
+
     /**
      * The CSS class to apply to the root of {@link Conference} to modify the
      * application layout.
         } = interfaceConfig;
         const {
             _iAmRecorder,
+            _isLobbyScreenVisible,
             _layoutClassName,
             _showPrejoin
         } = this.props;
                     { hideLabels || <Labels /> }
                 </div>
 
-                { filmstripOnly || _showPrejoin || <Toolbox /> }
+                { filmstripOnly || _showPrejoin || _isLobbyScreenVisible || <Toolbox /> }
                 { filmstripOnly || <Chat /> }
 
                 { this.renderNotificationsContainer() }
     return {
         ...abstractMapStateToProps(state),
         _iAmRecorder: state['features/base/config'].iAmRecorder,
+        _isLobbyScreenVisible: state['features/base/dialog']?.component === LobbyScreen,
         _layoutClassName: LAYOUT_CLASSNAMES[getCurrentLayout(state)],
         _roomName: getConferenceNameForTitle(state),
         _showPrejoin: isPrejoinPageVisible(state)