chore: simplify rendering of dynamic form part

src/Controller/Admin/Assignment/PickupFormController.php

@@ -21,8 +21,11 @@ class PickupFormController extends AbstractController
         $form = $this->createForm(AssignmentType::class, $assignment);
         $form->handleRequest($request);
 
-        return $this->render('admin/assignment/_form_pickup.html.twig', [
-            'form' => $form->createView(),
-        ]);
+        return $this->renderBlock('admin/assignment/_form.html.twig',
+            'partial_form',
+            [
+                'form' => $form->createView(),
+            ]
+        );
     }
 }