push button: Update after setting the emphasis

Otherwise we won't re-read the possibly new skin hints

src/controls/QskPushButton.cpp

@@ -87,6 +87,7 @@ void QskPushButton::setEmphasis( Emphasis emphasis )
     if ( emphasis != m_data->emphasis )
     {
         m_data->emphasis = emphasis;
+        update();
         Q_EMIT emphasisChanged( emphasis );
     }
 }