Fix #79 : Force la fonction countBySearch à retourner un entier

Change-Id: I9381ecf63e500e97b94d55ef7b46efd762389087

appli_sf/src/Repository/PersonRepository.php

@@ -38,7 +38,7 @@ class PersonRepository extends ServiceEntityRepository
         bool $onlyBirthYear = false,
         bool $withoutFirstName = false,
         bool $onlyNullHelpCode = false
-    ) {
+    ): int {
         $queryBuilder = $this->createQueryBuilder('p');
 
         $queryBuilder->select('COUNT(DISTINCT p.id)');