Revert "OXDEV-9553 Fix getting the last child in a template chain"

This reverts commit 8b31feb.

Author: AshrafOxid

src/Resolver/TemplateChain/DataObject/TemplateChain.php

@@ -76,20 +76,8 @@ public function getParent(TemplateTypeInterface $templateType): TemplateTypeInte
 
     public function getLastChild(): TemplateTypeInterface
     {
-        $extendedNamespaces = [];
-        $lastChild = null;
-
-        foreach ($this->chain as $templateType) {
-            $parentNamespace = $templateType->getParentNamespace();
-            if ($parentNamespace) {
-                $extendedNamespaces[$parentNamespace] = true;
-            }
-            if (!isset($extendedNamespaces[$templateType->getNamespace()])) {
-                $lastChild = $templateType;
-            }
-        }
-
-        return $lastChild ?? reset($this->chain);
+        reset($this->chain);
+        return current($this->chain);
     }
 
     public function hasParent(TemplateTypeInterface $templateType): bool