Make sure that internal_error_message is used during ErrorHandler initialization

Third argument for `Overblog\GraphQLBundle\Error\ErrorHandler` is the default
message to use when an error happen. As described in the documentation
`overblog_graphql.errors_handler.internal_error_message` can be used to set a
custom message.

Author: ferrastas

src/DependencyInjection/OverblogGraphQLExtension.php

@@ -207,7 +207,8 @@ private function setErrorHandler(array $config, ContainerBuilder $container): vo
 
         $container->register(ErrorHandler::class)
             ->setArgument(0, new Reference(EventDispatcherInterface::class))
-            ->setArgument(1, new Reference(ExceptionConverterInterface::class));
+            ->setArgument(1, new Reference(ExceptionConverterInterface::class))
+            ->setArgument(2, $config['errors_handler']['internal_error_message']);
 
         $container->register(ErrorHandlerListener::class)
             ->setArgument(0, new Reference(ErrorHandler::class))