Attempt to fix errors in Repair command tests

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

core/Command/Preview/Repair.php

@@ -42,6 +42,8 @@
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Question\ConfirmationQuestion;
 
+use function pcntl_signal;
+
 class Repair extends Command {
 	protected IConfig $config;
 	private IRootFolder $rootFolder;