Fix CPDFSDK_Widget::OnXFAAAction()
Fix CPDFSDK_Widget::OnXFAAAction()

Fix a couple issues with OnXFAAAction():
-- radio button widget should not call ProcessEvent() twice;
-- UpdateDocView should be called before returning;

R=jun_fang@foxitsoftware.com

Review URL: https://codereview.chromium.org/1809073004 .

DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium