Merge pull request #2000 from Diapolo/fix_indentation

fix some missing indentations in main.cpp for better readability

src/main.cpp

@@ -2018,7 +2018,6 @@ bool CBlock::AcceptBlock(CDiskBlockPos *dbp)
     CBlockIndex* pindexPrev = NULL;
     int nHeight = 0;
     if (hash != hashGenesisBlock) {
-
         map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
         if (mi == mapBlockIndex.end())
             return DoS(10, error("AcceptBlock() : prev block not found"));