Issue #3012350 by miksha: Fix "page not found" when deleting forms

fillpdf.admin.inc

@@ -581,7 +581,7 @@ function fillpdf_form_edit_submit($form, &$form_state) {
  */
 function fillpdf_form_delete_confirm($form, &$form_state, $pdf_form) {
   if (is_numeric(arg(3))) {
-    $pdf_form = fillpdf_load(arg(3, FALSE, FALSE));
+    $pdf_form = fillpdf_load(arg(3), FALSE, FALSE);
   }
   if (!$pdf_form) {
     drupal_not_found();