clean up code for doctrine/persistence 2.x

Author: xabbuh

src/Symfony/Bridge/Doctrine/Tests/Security/RememberMe/DoctrineTokenProviderTest.php

@@ -122,9 +122,7 @@ protected function bootstrapProvider(): DoctrineTokenProvider
         $config = ORMSetup::createConfiguration(true);
         $config->setSchemaManagerFactory(new DefaultSchemaManagerFactory());
 
-        if (!class_exists(\Doctrine\Persistence\Mapping\Driver\AnnotationDriver::class)) { // doctrine/persistence >= 3.0
-            $config->setLazyGhostObjectEnabled(true);
-        }
+        $config->setLazyGhostObjectEnabled(true);
 
         $connection = DriverManager::getConnection([
             'driver' => 'pdo_sqlite',