Update Magento2/Sniffs/Legacy/ClassReferencesInConfigurationFilesSniff.php

Co-authored-by: Jorge Cuerdo Álvarez <jocual@gmail.com>

Author: svera

Magento2/Sniffs/Legacy/ClassReferencesInConfigurationFilesSniff.php

@@ -131,24 +131,18 @@ private function collectClassesInConfig(SimpleXMLElement $xml): array
                 | //model_token | //writer_model | //clone_model | //frontend_model | //working_model
                 | //admin_renderer | //renderer',
         );
-        $classes = array_merge(
+$classes = array_merge(
             $classes,
             $this->getValuesFromXmlTagAttribute(
                 $xml,
                 '//@backend_model',
                 'backend_model'
-            )
-        );
-        $classes = array_merge(
-            $classes,
-            $this->getValuesFromXmlTagAttribute(
+            ),
+$this->getValuesFromXmlTagAttribute(
                 $xml,
                 '/config//preference',
                 'type'
-            )
-        );
-        $classes = array_merge(
-            $classes,
+            ),
             $this->getValuesFromXmlTagName(
                 $xml,
                 '/logging/*/expected_models/* | /logging/*/actions/*/expected_models/*',