Revert to stdout for MappingDescribeCommand

In f256d99, I did a global move to
stderr for notifications, and went a bit overboard for
MappingDescribeCommand, which purpose is to output a description.

Author: greg0ire

src/Tools/Console/Command/MappingDescribeCommand.php

@@ -65,7 +65,7 @@ protected function configure(): void
 
     protected function execute(InputInterface $input, OutputInterface $output): int
     {
-        $ui = (new SymfonyStyle($input, $output))->getErrorStyle();
+        $ui = new SymfonyStyle($input, $output);
 
         $entityManager = $this->getEntityManager($input);