Script correction of Lux Anima Runestone IDs 22540 (#8258)

db/re/item_db_usable.yml

@@ -56781,7 +56781,8 @@ Body:
       NoMail: true
       NoAuction: true
     Script: |
-      itemskill "RK_LUXANIMA",1;
+      if ((eaclass()&EAJ_THIRDMASK) == EAJ_RUNE_KNIGHT)
+         itemskill "RK_LUXANIMA",1;
   - Id: 22541
     AegisName: PCBang_Coupon_Box6
     Name: PC Room Coupon Box VI