rm hashFinalSproutRoot

related to https://git.hush.is/hush/hush3/issues/248

src/main.cpp

@@ -5960,20 +5960,6 @@ bool static LoadBlockIndexDB()
     pblocktree->ReadFlag("spentindex", fSpentIndex);
     LogPrintf("%s: spent index %s\n", __func__, fSpentIndex ? "enabled" : "disabled");
 
-    // Fill in-memory data
-    BOOST_FOREACH(const PAIRTYPE(uint256, CBlockIndex*)& item, mapBlockIndex)
-    {
-        CBlockIndex* pindex = item.second;
-        // - This relationship will always be true even if pprev has multiple
-        //   children, because hashSproutAnchor is technically a property of pprev,
-        //   not its children.
-        // - This will miss chain tips; we handle the best tip below, and other
-        //   tips will be handled by ConnectTip during a re-org.
-        if (pindex->pprev) {
-            pindex->pprev->hashFinalSproutRoot = pindex->hashSproutAnchor;
-        }
-    }
-
     // Load pointer to end of best chain
     BlockMap::iterator it = mapBlockIndex.find(pcoinsTip->GetBestBlock());
     if (it == mapBlockIndex.end())