badcomplete-795324: Default choice to 0
badcomplete-795324: Default choice to 0

If we are told to update ourselves when there isn't a new choice then
we reset the choice to 0. This avoids problems where we display the
wrong tab completion.

Signed-off-by: Joe Walker <7a17872fbb32c7d760c9a16ee3076daead11efcf@mozilla.com>

mozilla/gcli,joewalker/gcli,mozilla/gcli,mozilla/gcli,joewalker/gcli