uitest: use correct method to close a dialog

Change-Id: Ib62cc9465bb874d48b4e294a6f18d98de04a5518
Reviewed-on: https://gerrit.libreoffice.org/34672Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

uitest/writer_tests/tdf79236.py

@@ -93,7 +93,7 @@ class tdf79236(UITestCase):
             xTopSpnBtn.executeAction("DOWN", tuple())
 
         xOkBtn = xParagraphDlg.getChild("ok")
-        xOkBtn.executeAction("CLICK", tuple())
+        self.ui_test.close_dialog_through_button(xOkBtn)
 
         self.assertEqual(document.CurrentSelection.getByIndex(0).ParaLeftMargin, 0)
         self.assertEqual(document.CurrentSelection.getByIndex(0).ParaRightMargin, 0)