fix(av-moderation): Fixes sending wrong whitelist in json.

resources/prosody-plugins/mod_av_moderation_component.lua

                         room.av_moderation = {};
                         room.av_moderation_actors = {};
                     end
-                    room.av_moderation[mediaType] = {};
                     room.av_moderation_actors[mediaType] = occupant.nick;
                 end
             else
                 enabled = false;
-                if not room.av_moderation or not room.av_moderation[mediaType] then
+                if not room.av_moderation then
                     module:log('warn', 'Concurrent moderator enable/disable request or something is out of sync');
                     return true;
                 else