Fix Hush notarizations

[leto]

This code is running on Chainstrike Notary Node and fixes the bug where nodes do not sync with the network notarization data. txn_count was never initialized and happened to always be zero, which skipped important code 😿

Example happy debug.log lines:

2018-10-02 20:50:38 dpow: komodo_notarized_update nHeight.389077 notarized_height.389074 prev.389068
2018-10-02 20:50:38 dpow: HUSH ht.389077 NOTARIZED.389074 0000000090ecd5d3d0aaefa9e6d1e5c546b411f192607b1a455fc308d9632cdc KMDTXID.e755ea2e4e509653738d5672650460e52fbcf1cbeb82e13e8974695b5cb534e5 lens.(73 75)
2018-10-02 20:50:38 dpow: [HUSH] ht.389077 txi.2 signedmask.40c05b0465000000 numvins.13 numvouts.2 notarized.1 special.1

Example happy getinfo:

$ ./src/hush-cli getinfo
{
  "version": 1001450,
  "protocolversion": 170002,
  "walletversion": 60000,
  "balance": 7.99250000,
  "blocks": 389065,
  "timeoffset": 0,
  "connections": 9,
  "tls_connections": 2,
  "proxy": "",
  "difficulty": 222498227.8839397,
  "testnet": false,
  "keypoololdest": 1537032541,
  "keypoolsize": 101,
  "paytxfee": 0.00000000,
  "relayfee": 0.00000100,
  "errors": "",
  "notarizedhash": "000000055dc041e6723b0f57226fa0f2cbc0bdc65d22fc5155caea073f9c003e",
  "notarizedtxid": "a725122efe6a3c76eb8df171dffd4d0739c0b8c67ede58b31715b9aec7ba5c51",
  "notarized": 389062
} 

NOTE: Notarization data is not instantly available when a node starts, you will need to wait until your node sees a notarization transaction for your local node data to be updated and then be visible via getinfo.