Raid : handling both prices (#816)

### Description

Please explain the changes you made here.

### Checklist

- [ ] Created tests which fail without the change (if possible)
- [ ] All tests passing
- [ ] Extended the documentation, if necessary

---------

Co-authored-by: Armand Didierjean <[email protected]>

Author: maximeroucher

app/modules/raid/utils/utils_raid.py

@@ -88,14 +88,21 @@ async def validate_payment(
         raise RaidPayementError(checkout_id)
     participant_id = participant_checkout.participant_id
     prices = await get_core_data(coredata_raid.RaidPrice, db)
-    if prices.student_price and paid_amount == prices.student_price:
+    if (prices.student_price and paid_amount == prices.student_price) or (
+        prices.external_price and paid_amount == prices.external_price
+    ):
         await cruds_raid.confirm_payment(participant_id, db)
     elif prices.t_shirt_price and paid_amount == prices.t_shirt_price:
         await cruds_raid.confirm_t_shirt_payment(participant_id, db)
-    elif (
-        prices.student_price
-        and prices.t_shirt_price
-        and paid_amount == prices.student_price + prices.t_shirt_price
+    elif prices.t_shirt_price and (
+        (
+            prices.student_price
+            and paid_amount == prices.student_price + prices.t_shirt_price
+        )
+        or (
+            prices.external_price
+            and paid_amount == prices.external_price + prices.t_shirt_price
+        )
     ):
         await cruds_raid.confirm_payment(participant_id, db)
         await cruds_raid.confirm_t_shirt_payment(participant_id, db)