ref(toolbar): remove reference to unused config autoEnableDesktopSharing

config.js

     // List of undocumented settings used in jitsi-meet
     /**
      alwaysVisibleToolbar
-     autoEnableDesktopSharing
      autoRecord
      autoRecordToken
      debug

react/features/base/config/functions.js

     '_peerConnStatusRtcMuteTimeout',
     'abTesting',
     'alwaysVisibleToolbar',
-    'autoEnableDesktopSharing',
     'autoRecord',
     'autoRecordToken',
     'avgRtpStatsN',