[form][controller] pass suggested users on to workflow form

src/Bundle/ChillMainBundle/Form/WorkflowStepType.php

@@ -154,6 +154,7 @@ class WorkflowStepType extends AbstractType
                     'label' => 'workflow.dest for next steps',
                     'multiple' => true,
                     'mapped' => false,
+                    'suggested' => $options['suggested_users'],
                 ])
                 ->add('future_dest_emails', ChillCollectionType::class, [
                     'label' => 'workflow.dest by email',
@@ -200,6 +201,7 @@ class WorkflowStepType extends AbstractType
             ->setAllowedTypes('transition', 'bool')
             ->setRequired('entity_workflow')
             ->setAllowedTypes('entity_workflow', EntityWorkflow::class)
+            ->setDefault('suggested_users', [])
             ->setDefault('constraints', [
                 new Callback(
                     function ($step, ExecutionContextInterface $context, $payload) {