Corrects an item name

db/re/item_upgrade.yml

@@ -48,7 +48,7 @@ Body:
       - Item: Magic_Sword
       - Item: Sword_Of_Bluefire
       - Item: Avenger
-      - Item: Iron_Staff
+      - Item: Aeon_Staff
       - Item: Oriental_Sword
       - Item: Undine_Spear_K
       - Item: Demon_Hunting_Bible_K
@@ -83,7 +83,7 @@ Body:
       - Item: Magic_Sword
       - Item: Sword_Of_Bluefire
       - Item: Avenger
-      - Item: Iron_Staff
+      - Item: Aeon_Staff
       - Item: Oriental_Sword
       - Item: Undine_Spear_K
       - Item: Demon_Hunting_Bible_K