AMC - fix programmed packets count

[davidetome]

This PR fixes the count of programmed packets making FirmwareUpdater give a successful message at the end of the operation; see :

• https://github.com/robotology/icub-main/issues/950

cc @valegagge @marcoaccame @Nicogene @sgiraz

[davidetome]

converting to draft after a f2f w/ @marcoaccame , this solution works but it is not the best way

cc @valegagge

[davidetome]

Ok, thanks. Just pls align the else using spaces rather than tabs

done w/ last commit 👍🏼