blockchain: fix total_height in getblocks.bin response

src/cryptonote_core/blockchain.cpp

@@ -2493,6 +2493,7 @@ bool Blockchain::find_blockchain_supplement(const uint64_t req_start_block, cons
   }
 
   db_rtxn_guard rtxn_guard(m_db);
+  total_height = get_current_blockchain_height();
   blocks.reserve(std::min(std::min(max_count, (size_t)10000), (size_t)(total_height - start_height)));
   CHECK_AND_ASSERT_MES(m_db->get_blocks_from(start_height, 3, max_count, FIND_BLOCKCHAIN_SUPPLEMENT_MAX_SIZE, blocks, pruned, true, get_miner_tx_hash),
       false, "Error getting blocks");