monitoring/CLI: Fix error on CSV output

Signed-off-by: Eric Lippmann <eric.lippmann@netways.de>

fixes #10921

library/Icinga/File/Csv.php

@@ -26,7 +26,7 @@ class Csv
     {
         $first = true;
         $csv = '';
-        foreach ($this->query->getQuery()->fetchAll() as $row) {
+        foreach ($this->query->fetchAll() as $row) {
             if ($first) {
                 $csv .= implode(',', array_keys((array) $row)) . "\r\n";
                 $first = false;