SiteController : correctif producer context

frontend/controllers/SiteController.php

         $signupForm = new SignupForm();
         $producerManager = $this->getProducerManager();
         $producer = $producerManager->findOneProducerById($id);
+        $this->getLogic()->setProducerContext($producer);
         $loginForm->id_producer = $id;
         $signupForm->id_producer = $id;
         $signupForm->option_user_producer = 'user';