pieforms: fix maxfilesize variable

Signed-off-by: Ruslan Kabalin <ruslan.kabalin@luns.net.uk>

htdocs/lib/pieforms/pieform/elements/file.php

@@ -34,7 +34,7 @@
 function pieform_element_file(Pieform $form, $element) {/*{{{*/
     $result = '';
     if (isset($element['maxfilesize']) && is_int($element['maxfilesize'])){
-        $result = '<input type="hidden" name="MAX_FILE_SIZE" value="' . $maxfilesize . '"/>';
+        $result = '<input type="hidden" name="MAX_FILE_SIZE" value="' . $element['maxfilesize'] . '"/>';
     }
     $result .= '<input type="file"' . $form->element_attributes($element) . '>';
     return $result;