change template name format to twig format

instead of the older symfony/templating format
fixes #263

Author: esserj

CHANGELOG.md

@@ -1,6 +1,11 @@
 Changelog
 =========
 
+2.1.1
+-----
+
+* Fixed another template reference to work with Symfony 4.
+
 2.1.0
 -----
 

src/DependencyInjection/CmfCoreExtension.php

@@ -295,7 +295,7 @@ public function setupFormTypes(ContainerBuilder $container, LoaderInterface $loa
             // if there is twig, register our form type with twig
             if ($container->hasParameter('twig.form.resources')) {
                 $resources = $container->getParameter('twig.form.resources');
-                $container->setParameter('twig.form.resources', array_merge($resources, ['CmfCoreBundle:Form:checkbox_url_label_form_type.html.twig']));
+                $container->setParameter('twig.form.resources', array_merge($resources, ['@CmfCore/Form/checkbox_url_label_form_type.html.twig']));
             }
         }
     }