Trigger autoload on detecting doctrine/mongodb-odm version (#173)

This allows the auload to be triggered, when checking for the presence of
a `doctrine/mongodb-odm >= 2.0` repository class.

This is needed as during `bin/console cache:warmup`, the check would fail
even if the checked class is indeed present, at the class was not autoloaded.

Document/RefreshTokenRepository.php

@@ -6,7 +6,7 @@
 use Doctrine\ODM\MongoDB\Repository\DocumentRepository as MongoDBDocumentRepository;
 use Gesdinet\JWTRefreshTokenBundle\Service\RefreshToken;
 
-if (class_exists(MongoDBDocumentRepository::class, false)) {
+if (class_exists(MongoDBDocumentRepository::class)) {
     // Support for doctrine/mongodb-odm >= 2.0
     class BaseRepository extends MongoDBDocumentRepository
     {