rc: another minor tweak for compat

src/etc/rc.initial.password

@@ -33,7 +33,11 @@ require_once('auth.inc');
 
 $fp = fopen('php://stdin', 'r');
 
-if (isset($argv[1]) && isset($argv[2]) && $argv[1] === '-h' && $argv[2] === '0') {
+/*
+ * Mocking "pw usermod root -h 0", we always have the root
+ * user but we do not know what the future will bring...
+ */
+if (isset($argv[2]) && isset($argv[3]) && $argv[2] === '-h' && $argv[3] === '0') {
      $admin_user = &getUserEntryByUID(0);
      if (!$admin_user) {
          echo "user not found\n";