[BUGFIX] ignore pages.l18n_cfg of translated posts when searching for…

… translations

When creating new translation, TYPO3 sets this field to the same value as the translation source,
so nothing can be found for pages.l18n_cfg == 2 ("Hide page if no translation for current language exists").

Classes/Domain/Repository/PostRepository.php

@@ -270,7 +270,7 @@ public function findCurrentPost(): ?Post
     protected function getPostWithLanguage(int $pageId, int $languageId): ?Post
     {
         $query = $this->createQuery();
-        $constraints = $this->defaultConstraints;
+        $constraints[] = $query->equals('doktype', Constants::DOKTYPE_BLOG_POST);
 
         if ($languageId > 0) {
             $constraints[] = $query->equals('l10n_parent', $pageId);