Fixes #11130, renames aghosted var

because it is no longer used solely for aghosting.

code/modules/mob/dead/observer/observer.dm

@@ -217,7 +217,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 			return
 	mind.current.ajourn=0
 	mind.current.key = key
-	mind.current.aghosted = null
+	mind.current.teleop = null
 	if(!admin_ghosted)
 		announce_ghost_joinleave(mind, 0, "They now occupy their body again.")
 	return 1