message: log: Move "Leaving block file [...]: [...]" log message to debug category
diff: @@ -3051,7 +3051,7 @@ static bool FindBlockPos(FlatFilePos &pos, unsigned int nAddSize, unsigned int n
  if ((int)nFile != nLastBlockFile) {
  if (!fKnown) {
  - LogPrintf("Leaving block file %i: %s\n", nLastBlockFile, vinfoBlockFile[nLastBlockFile].ToString());
  + LogPrint(BCLog::VALIDATION, "Leaving block file %i: %s\n", nLastBlockFile, vinfoBlockFile[nLastBlockFile].ToString());
  }
  FlushBlockFile(!fKnown, finalize_undo);
  nLastBlockFile = nFile;
  