Fixes mistakenly removed button.

modules/UI/UI.js

     VideoLayout.showModeratorIndicator();
 
     Toolbar.showSipCallButton(isModerator);
-    Toolbar.showRecordingButton(isModerator);
+    Toolbar.showSharedVideoButton(isModerator);
     Recording.showRecordingButton(isModerator);
     SettingsMenu.showStartMutedOptions(isModerator);
     SettingsMenu.showFollowMeOptions(isModerator);