dextrose-updater 5.3: change the updater flag file

This change was done to sync with changes in the sugar control panel

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>
sugar-toolkit-gtk3 0.100.2.olpcau

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>
sugar: 0.100.1 3.olpcau

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>