Fix test

...after 7764439f "WidgetDefinition: add
'action' state for the PushButton" introduced code that downcasts that
suspicious ImplControlValue to a PushButtonValue

Change-Id: I3ed24cc4a862d53ad5b6e95b4707bab7947ce7ba
Reviewed-on: https://gerrit.libreoffice.org/71998Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Jenkins

vcl/qa/cppunit/widgetdraw/WidgetDefinitionReaderTest.cxx

@@ -58,7 +58,7 @@ void WidgetDefinitionReaderTest::testRead()
         std::vector<std::shared_ptr<vcl::WidgetDefinitionState>> aStates
             = aDefinition.getDefinition(ControlType::Pushbutton, ControlPart::Entire)
                   ->getStates(ControlType::Pushbutton, ControlPart::Entire, eState,
-                              ImplControlValue());
+                              PushButtonValue());
 
         CPPUNIT_ASSERT_EQUAL(size_t(2), aStates.size());