daemon.print_bc: don't print difficulty twice

src/daemon/rpc_command_executor.cpp

@@ -557,7 +557,7 @@ bool t_rpc_command_executor::print_blockchain_info(uint64_t start_block_index, u
     if (!first)
       std::cout << std::endl;
     std::cout
-      << "height: " << header.height << ", timestamp: " << header.timestamp << ", difficulty: " << header.difficulty
+      << "height: " << header.height << ", timestamp: " << header.timestamp
       << ", size: " << header.block_size << ", transactions: " << header.num_txes << std::endl
       << "major version: " << (unsigned)header.major_version << ", minor version: " << (unsigned)header.minor_version << std::endl
       << "block id: " << header.hash << ", previous block id: " << header.prev_hash << std::endl