Fixes rev mindswap (#34567)

code/game/gamemodes/traitor/double_agents.dm

@@ -14,7 +14,7 @@
 
 	traitors_possible = 10 //hard limit on traitors if scaling is turned off
 	num_modifier = 4 // Four additional traitors
-	antag_datum = ANTAG_DATUM_IAA
+	antag_datum = /datum/antagonist/traitor/internal_affairs
 
 	announce_text = "There are Nanotrasen Internal Affairs Agents trying to kill each other!\n\
 	<span class='danger'>IAA</span>: Eliminate your targets and protect yourself!\n\

code/game/gamemodes/traitor/traitor.dm

@@ -26,7 +26,7 @@
 	var/list/datum/mind/pre_traitors = list()
 	var/traitors_possible = 4 //hard limit on traitors if scaling is turned off
 	var/num_modifier = 0 // Used for gamemodes, that are a child of traitor, that need more than the usual.
-	var/antag_datum = ANTAG_DATUM_TRAITOR //what type of antag to create
+	var/antag_datum = /datum/antagonist/traitor //what type of antag to create
 	var/traitors_required = TRUE //Will allow no traitors