fix default unit for energy-kcal_prepared, bug #3022
fix default unit for energy-kcal_prepared, bug #3022

openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server