Updates subsystem definitions to new standards. (#17470)

* My heart is dragging me down into...

...oblivion!

* drifting closer to the edge but she won't have me

* ever round me we are dead before we meet her

* for the last time

* wake up in sweat

* n

* fff

* uff

---------

Co-authored-by: Matt Atlas <liermattia@gmail.com>

code/modules/admin/topic.dm

@@ -407,7 +407,7 @@
 		message_admins("<span class='notice'>[key_name_admin(usr)] set the mode as [master_mode].</span>", 1)
 		to_world("<span class='notice'><b>The mode is now: [master_mode]</b></span>")
 		Game() // updates the main game menu
-		SSpersist_config.last_gamemode = master_mode
+		SSpersistent_configuration.last_gamemode = master_mode
 		.(href, list("c_mode"=1))
 
 	else if(href_list["f_secret2"])