Create Topic option is available even if Topics are hidden

As Admin we've hidden 'Topics, for a particular forum. All we have available for this particular forum is 'Chat'. However it is possible to enter a post into the Chat and then select 'Create topic' (and Create task) from the ... menu.

If Topics have been disabled in a particular forum, then the menu option to convert a 'Chat' post to 'Topic' should be removed.