Fix editor non author can remove himself as editor

src/Controller/CapsuleEditorController.php

@@ -243,7 +243,7 @@ class CapsuleEditorController extends AbstractController
             return $this->redirectToRoute('app_logout');
         }
 
-        if ($editor === $current_user) {
+        if ($editor_id === $capsule->getCreationAuthor()->getId()) {
             $this->addFlash(
                 'warning',
                 $this->translator->trans(