Adding npc: for halloween_2013.txt

npc/scripts_athena.conf

@@ -93,6 +93,7 @@ npc: npc/events/god_se_festival.txt
 //npc: npc/events/halloween_2006.txt
 //npc: npc/events/halloween_2008.txt
 //npc: npc/events/halloween_2009.txt
+//npc: npc/events/halloween_2013.rxr
 // - Official idRO Idul Fitri Event
 //npc: npc/events/idul_fitri.txt
 // - Official Lunar New Year (2008) Event (iRO)