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/base/bootloaderinstallipod.cpp

@@ -174,6 +174,7 @@ bool BootloaderInstallIpod::uninstall(void)
     if (delete_bootloader(&ipod)==0) {
         emit logItem(tr("Successfully removed bootloader"), LOGOK);
         logInstall(LogRemove);
+        emit logProgress(1, 1);
         emit done(false);
         ipod_close(&ipod);
         return true;