refactor: Modernize header sync logs

No change in behavior, only the modern aliases and types are used.

src/validation.cpp

@@ -4188,9 +4188,9 @@ bool ChainstateManager::ProcessNewBlockHeaders(const std::vector<CBlockHeader>&
     if (NotifyHeaderTip(*this)) {
         if (IsInitialBlockDownload() && ppindex && *ppindex) {
             const CBlockIndex& last_accepted{**ppindex};
-            const int64_t blocks_left{(GetTime() - last_accepted.GetBlockTime()) / GetConsensus().nPowTargetSpacing};
+            int64_t blocks_left{(NodeClock::now() - last_accepted.Time()) / GetConsensus().PowTargetSpacing()};
             const double progress{100.0 * last_accepted.nHeight / (last_accepted.nHeight + blocks_left)};
-            LogPrintf("Synchronizing blockheaders, height: %d (~%.2f%%)\n", last_accepted.nHeight, progress);
+            LogInfo("Synchronizing blockheaders, height: %d (~%.2f%%)\n", last_accepted.nHeight, progress);
         }
     }
     return true;
@@ -4214,9 +4214,9 @@ void ChainstateManager::ReportHeadersPresync(const arith_uint256& work, int64_t
     bool initial_download = IsInitialBlockDownload();
     GetNotifications().headerTip(GetSynchronizationState(initial_download), height, timestamp, /*presync=*/true);
     if (initial_download) {
-        const int64_t blocks_left{(GetTime() - timestamp) / GetConsensus().nPowTargetSpacing};
+        int64_t blocks_left{(NodeClock::now() - NodeSeconds{std::chrono::seconds{timestamp}}) / GetConsensus().PowTargetSpacing()};
         const double progress{100.0 * height / (height + blocks_left)};
-        LogPrintf("Pre-synchronizing blockheaders, height: %d (~%.2f%%)\n", height, progress);
+        LogInfo("Pre-synchronizing blockheaders, height: %d (~%.2f%%)\n", height, progress);
     }
 }