Make file_resup work with IEF.

Closes #3493701

js/file-resup.js

@@ -168,6 +168,7 @@
           extensions: extensions,
           query: {
             form_build_id: $('input[name="form_build_id"]', $this[0].form).val(),
+            form_token: $('input[name="form_token"]', $this[0].form).val(),
             form_parents: $this.data('parents'),
             form_type: $this.data('form-type'),
             entity_type_id: $this.data('entity-type-id'),