Merged PR 4347: fixed rate exchange

# Description

Fixed exchange rate for superhog fee

# Checklist

- [x] The edited models and dependants run properly with production data.
- [ ] The edited models are sufficiently documented.
- [ ] The edited models contain PK tests, and I've ran and passed them.
- [ ] I have checked for DRY opportunities with other models and docs.
- [ ] I've picked the right materialization for the affected models.

# Other

- [ ] Check if a full-refresh is required after this PR is merged.

fixed rate exchange

Related work items: #27178

models/intermediate/core/int_core__waiver_fees.sql

@@ -70,7 +70,7 @@ select
                 )
             )
             * ser.rate
-        else p.amount
+        else p.amount * ser.rate
     end as superhog_fee_in_gbp
 from stg_core__verification_to_payment vtp
 left join stg_core__payment p on vtp.id_payment = p.id_payment