Merge bitcoin/bitcoin#24033: log: Remove GetAdjustedTime from IBD header progress estimation

fac22fd log: Remove GetAdjustedTime from IBD header progress estimation (MarcoFalke)

Pull request description:

  This is a "refactor" that shouldn't change behaviour, because the two times are most likely equal. A minimum of 5 outbound peers are needed to adjust the time. And if the time is adjusted, it will be by at most 70 minutes (`DEFAULT_MAX_TIME_ADJUSTMENT`). Thus, the progress estimate should differ by at most 7 blocks.

ACKs for top commit:
  laanwj:
    Code review ACK fac22fd
  vincenzopalazzo:
    ACK bitcoin/bitcoin@fac22fd

Tree-SHA512: bf9f5eef66db0110dd268cf6dbfab64b9c11ba776924f5b386ceae3f2d005272cceb87ebcc96e0c8b854c051514854a2a5af39ae43bad008fac685b5aafaabd0

Author: MarcoFalke

src/validation.cpp

@@ -3528,7 +3528,10 @@ bool ChainstateManager::ProcessNewBlockHeaders(const std::vector<CBlockHeader>&
     }
     if (NotifyHeaderTip(ActiveChainstate())) {
         if (ActiveChainstate().IsInitialBlockDownload() && ppindex && *ppindex) {
-            LogPrintf("Synchronizing blockheaders, height: %d (~%.2f%%)\n", (*ppindex)->nHeight, 100.0/((*ppindex)->nHeight+(GetAdjustedTime() - (*ppindex)->GetBlockTime()) / Params().GetConsensus().nPowTargetSpacing) * (*ppindex)->nHeight);
+            const CBlockIndex& last_accepted{**ppindex};
+            const int64_t blocks_left{(GetTime() - last_accepted.GetBlockTime()) / chainparams.GetConsensus().nPowTargetSpacing};
+            const double progress{100.0 * last_accepted.nHeight / (last_accepted.nHeight + blocks_left)};
+            LogPrintf("Synchronizing blockheaders, height: %d (~%.2f%%)\n", last_accepted.nHeight, progress);
         }
     }
     return true;