[ticket/12597] Update pull-request

Removes a useless comment.
Switchs command name from cron:execute-all to cron:run-all.
Replaces assertEquals by assertSame

PHPBB3-12597

phpBB/cron.php

@@ -50,7 +50,6 @@ if ($cron_lock->acquire())
 {
 	$cron = $phpbb_container->get('cron.manager');
 
-	// If invalid task is specified, empty $run_tasks is passed to do_cron which then does nothing
 	$task = $cron->find_task($cron_type);
 	if ($task)
 	{