Fix migrations error with prefix

src/Migrations/Version20200408160435.php

@@ -23,7 +23,7 @@ final class Version20200408160435 extends AbstractMigration
         $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'mysql', 'Migration can only be executed safely on \'mysql\'.');
 
         $this->addSql('ALTER TABLE '.$_ENV['DATABASE_PREFIX'].'rubrique ADD media_id INT DEFAULT NULL');
-        $this->addSql('ALTER TABLE '.$_ENV['DATABASE_PREFIX'].'rubrique ADD CONSTRAINT FK_8FA4097CEA9FDD75 FOREIGN KEY (media_id) REFERENCES media__media (id)');
+        $this->addSql('ALTER TABLE '.$_ENV['DATABASE_PREFIX'].'rubrique ADD CONSTRAINT FK_8FA4097CEA9FDD75 FOREIGN KEY (media_id) REFERENCES '.$_ENV['DATABASE_PREFIX'].'media__media (id)');
         $this->addSql('CREATE INDEX IDX_8FA4097CEA9FDD75 ON '.$_ENV['DATABASE_PREFIX'].'rubrique (media_id)');
     }