Litecoin: fix setgenerate for regtest mode

src/rpcmining.cpp

@@ -178,7 +178,7 @@ Value setgenerate(const Array& params, bool fHelp)
                 LOCK(cs_main);
                 IncrementExtraNonce(pblock, chainActive.Tip(), nExtraNonce);
             }
-            while (!CheckProofOfWork(pblock->GetHash(), pblock->nBits)) {
+            while (!CheckProofOfWork(pblock->GetPoWHash(), pblock->nBits)) {
                 // Yes, there is a chance every nonce could fail to satisfy the -regtest
                 // target -- 1 in 2^(2^32). That ain't gonna happen.
                 ++pblock->nNonce;