Sapling and Overwinter network upgrades are always active

These NU's are always active for Hush Arrakis Chains so this code only serves
to slow down all operations by constantly being checked. So we disable them
which will speed up syncing, mining and creating transactions.

src/miner.cpp

@@ -234,7 +234,7 @@ CBlockTemplate* CreateNewBlock(CPubKey _pk,const CScript& _scriptPubKeyIn, int32
         const Consensus::Params &consensusParams = chainparams.GetConsensus();
         uint32_t consensusBranchId = CurrentEpochBranchId(nHeight, consensusParams);
         // Sapling NU is always active
-        bool sapling = true; //NetworkUpgradeActive(nHeight, consensusParams, Consensus::UPGRADE_SAPLING);
+        const bool sapling = true; //NetworkUpgradeActive(nHeight, consensusParams, Consensus::UPGRADE_SAPLING);
 
         const int64_t nMedianTimePast = pindexPrev->GetMedianTimePast();
         uint32_t proposedTime = GetTime();