Fix schema

I had this error in my project:

```
[Doctrine\DBAL\DBALException]                                                                                                                                                                                                                             
Exception has been thrown in "beforeScenario" hook, defined in Hypebeast\Bundle\WebBundle\Behat\FeatureContext::purgeDatabase()                                                                                                                           
An exception occurred while executing 'DELETE FROM sylius_address':                                                                                                                                                                                       
SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`hypebeast_test`.`sylius_address`, CONSTRAINT `FK_B97FF058A76ED395` FOREIGN KEY (`user_id`) REFERENCES `sylius_user` (`id`))  
                                                                                                                                                                                                                                                        
[PDOException]                                                                                                                                                                                                                                            
SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`hypebeast_test`.`sylius_address`, CONSTRAINT `FK_B97FF058A76ED395` FOREIGN KEY (`user_id`) REFERENCES `sylius_user` (`id`))                                        
```

Should be fixed now.