message: Don't truncate label for tracknbar name (Qt)
  Setting truncate option for QString leftJustified method to false fixes 10 character truncation issue noted in issue 9489
diff: @@ -1409,7 +1409,7 @@ void CvTrackbar::update(int myvalue)
  void CvTrackbar::setLabel(int myvalue)
  {
  - QString nameNormalized = name_bar.leftJustified( 10, ' ', true );
  + QString nameNormalized = name_bar.leftJustified( 10, ' ', false );
  QString valueMaximum = QString("%1").arg(slider->maximum());
  QString str = QString("%1 (%2/%3)").arg(nameNormalized).arg(myvalue,valueMaximum.length(),10,QChar('0')).arg(valueMaximum);
  label->setText(str);
  