message: modify the sync numbers of start_sync
diff: @@ -1537,7 +1537,7 @@ namespace eosio {
  else {
  c->last_handshake_recv.last_irreversible_block_num = msg.known_trx.pending;
  reset_lib_num (c);
  - start_sync(c, msg.known_blocks.pending);
  + start_sync(c, msg.known_trx.pending);
  }
  }
  