Fix 2.x -> 3.x merge

Author: Kocal

src/TwigComponent/src/ComponentTemplateFinder.php

@@ -34,7 +34,7 @@ public function findAnonymousComponentTemplate(string $name): ?string
         }
 
         $template = rtrim($this->directory, '/').'/'.$componentPath.'/index.html.twig';
-        if ($loader->exists($template)) {
+        if ($this->loader->exists($template)) {
             return $template;
         }