Revert "Adds a second parameter named domain to muc_size module."

This reverts commit e2e04e3f16.

resources/prosody-plugins/mod_muc_size.lua

 function handle_get_room_size(event)
 	local params = parse(event.request.url.query);
 	local room_name = params["room"];
-	local domain_name = params["domain"];
-	local room_address = room_name .. "@" .. domain_name;
-	local room = get_room_from_jid(room_address);
+	local room = get_room_from_jid(room_name);
 	local participant_count = 0;
 
-	log("debug", "Querying room %s", tostring(room_address));
+	log("debug", "Querying room %s", tostring(room_name));
 
 	if room then
 		local occupants = room._occupants;
 function handle_get_room (event)
 	local params = parse(event.request.url.query);
 	local room_name = params["room"];
-	local domain_name = params["domain"];
-	local room_address = room_name .. "@" .. domain_name;
-	local room = get_room_from_jid(room_address);
+	local room = get_room_from_jid(room_name);
 	local participant_count = 0;
 	local occupants_json = array();
 
-	log("debug", "Querying room %s", tostring(room_address));
+	log("debug", "Querying room %s", tostring(room_name));
 
 	if room then
 		local occupants = room._occupants;