cleanup: Remove obsolete config option.

config.js

         // Domain for authenticated users. Defaults to <domain>.
         // authdomain: 'jitsi-meet.example.com',
 
-        // Call control component (Jigasi).
-        // call_control: 'callcontrol.jitsi-meet.example.com',
-
         // Focus component domain. Defaults to focus.<domain>.
         // focus: 'focus.jitsi-meet.example.com',