Remove obsolete port opening

We have an nginx reverse proxy for botka instead.

site-cookbooks/kosmos-hubot/recipes/botka_freenode.rb

@@ -116,11 +116,4 @@ unless node.chef_environment == "development"
   end
 
   nginx_certbot_site express_domain
-
-  include_recipe "firewall"
-  firewall_rule 'hubot_express_botka_freenode' do
-    port     express_port
-    protocol :tcp
-    command  :allow
-  end
 end