smith-members: SmithMembers.CurrentSession is not updated

Seen here: https://forum.duniter.org/t/gcli-sadapte-au-runtime-800-nouveau-parcours-forgeron/11880/20

Joss was promoted to Smith but its expires_on value is set to 336 which is the default delay (in number of sessions) as if current session was still 0.

However current Session.CurrentIndex is 75.

This is not consitent.

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