Fix ohme import when multiple payments have same ohm identifier (#11496)

Co-authored-by: Rémi <[email protected]>

src/Repository/Contribution/PaymentRepository.php

@@ -16,12 +16,14 @@ public function __construct(ManagerRegistry $registry)
 
     public function findOneByOhmeIdentifier(string $identifier): ?Payment
     {
-        return $this->createQueryBuilder('payment')
+        $payments = $this->createQueryBuilder('payment')
             ->where('payment.ohmeId = :identifier')
             ->setParameter('identifier', $identifier)
             ->getQuery()
-            ->getOneOrNullResult()
+            ->getResult()
         ;
+
+        return $payments[0] ?? null;
     }
 
     public function save(Payment $payment): void