fix deprecations: set choices_as_values = true + flip content of choices options

Form/Type/AppendScopeChoiceTypeTrait.php

@@ -31,6 +31,7 @@ use Chill\MainBundle\Entity\User;
 use Chill\MainBundle\Entity\Center;
 use Symfony\Component\Security\Core\Role\Role;
 use Chill\MainBundle\Form\Type\DataTransformer\ScopeTransformer;
+use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 
 /**
  * Trait to add an input with reachable scope for a given center and role.

Form/Type/ComposedRoleScopeType.php

@@ -28,6 +28,7 @@ use Chill\MainBundle\Entity\Scope;
 use Chill\MainBundle\Security\RoleProvider;
 use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\FormEvents;
+use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 
 /**
  * Form to Edit/create a role scope. If the role scope does not

Form/Type/Export/PickFormatterType.php

@@ -22,6 +22,8 @@ namespace Chill\MainBundle\Form\Type\Export;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\OptionsResolver;
+use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
+
 use Chill\MainBundle\Export\ExportManager;
 
 /**