Restrict room creation

src/freedombone-app-xmpp

       echo 'http_upload_file_size_limit = 307200';
       echo '';
       echo "Component \"chat.${DEFAULT_DOMAIN_NAME}\" \"muc\"";
+      echo '    restrict_room_creation = true';
       echo '    name = "Chatrooms"';
       echo '    modules_enabled = {';
       echo '        "muc_limits";';