fix: ArticleBundle 2.6.x still using forms from config/forms_sulu_25_or_lower/article_settings.xml

see: #705

Author: treck

DependencyInjection/SuluArticleExtension.php

@@ -189,7 +189,7 @@ public function prepend(ContainerBuilder $container)
                     ],
                     'forms' => [
                         'directories' => [
-                            \class_exists(LocalizedLastModifiedBehavior::class)
+                            \interface_exists(LocalizedLastModifiedBehavior::class)
                                 ? __DIR__ . '/../Resources/config/forms'
                                 : __DIR__ . '/../Resources/config/forms_sulu_25_or_lower',
                         ],