protocol: remove hop count on block propagation

It is unused, as it was apparently a future optimization,
and it leaks some information (though since pools publish
thei blocks they find, that amount seems small).

src/cryptonote_core/cryptonote_core.cpp

@@ -1035,7 +1035,6 @@ namespace cryptonote
     {
       cryptonote_connection_context exclude_context = boost::value_initialized<cryptonote_connection_context>();
       NOTIFY_NEW_BLOCK::request arg = AUTO_VAL_INIT(arg);
-      arg.hop = 0;
       arg.current_blockchain_height = m_blockchain_storage.get_current_blockchain_height();
       std::list<crypto::hash> missed_txs;
       std::list<cryptonote::blobdata> txs;