rbutil: show progress bar during bootloader uninstall

Useful for targets that needs multi-stage uninstall. On current
targets (with Uninstall capability) the progress is updated to
100% when bootloader uninstall is successfully finished.

Change-Id: I61be1c4f5cfc2d2f35fa5005962be9703888447d

rbutil/rbutilqt/rbutilqt.cpp

@@ -523,7 +523,6 @@ void RbUtilQt::uninstallBootloader(void)
            QMessageBox::Yes | QMessageBox::No) != QMessageBox::Yes) return;
     // create logger
     ProgressLoggerGui* logger = new ProgressLoggerGui(this);
-    logger->setProgressVisible(false);
     logger->show();
 
     QString platform = RbSettings::value(RbSettings::Platform).toString();