banlist: log post-swept banlist size at startup
banlist: log post-swept banlist size at startup

We are currently logging the size of the banlist before SweepBanned()
has been called, meaning the value may be incorrect.


Former-commit-id: 7b175f38901822b2c998dccdc5cafcf33a735b17
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin