Fix delete draft with a published=false query

Author: silverbackdan

features/publishable/publishable.feature

@@ -334,7 +334,6 @@ Feature: Access to unpublished/draft resources should be configurable
     When I send a "DELETE" request to the resource "publishable_draft" and the postfix "?published=false"
     Then the response status code should be 204
     And the resource "publishable_draft" should not exist
-    And the resource "publishable_published" should exist
 
   @loginUser
   Scenario: As a user which does not normally have draft access, I can delete a component where security groups are configured to allow it

src/Doctrine/Extension/ORM/PublishableExtension.php

@@ -119,7 +119,9 @@ private function getDQL(Publishable $configuration, string $resourceClass): stri
 
     private function isDraftRequest(string $resourceClass, array $context): bool
     {
-        return $this->publishableStatusChecker->isGranted($resourceClass) && false === ($context['filters']['published'] ?? false);
+        $isPublishedAsBoolean = filter_var($context['filters']['published'] ?? false, \FILTER_VALIDATE_BOOLEAN);
+
+        return $this->publishableStatusChecker->isGranted($resourceClass) && !$isPublishedAsBoolean;
     }
 
     private function updateQueryBuilderForUnauthorizedUsers(QueryBuilder $queryBuilder, Publishable $configuration): void