Fix interface version number printing in --show-iface

Before

Version: Wanted [8, 0, 9, 0, 2, 0, 1, 9, 0, 4, 2, 5],
         got    [8, 0, 9, 0, 2, 0, 1, 9, 0, 4, 2, 5]

After

Version: Wanted 809020190425,
         got    809020190425