Performance fix for IsSuperMajority check

The IsSuperMajority check was being done for blocks with ANY of
the SIZE_FORK_VERSION bits set, instead of blocks with ALL of those
bits set.

Thanks to Michael Ruddy for finding during code review.

src/main.cpp

@@ -1857,7 +1857,7 @@ static int64_t nTimeCallbacks = 0;
 static int64_t nTimeTotal = 0;
 
 static bool DidBlockTriggerSizeFork(const CBlock &block, const CBlockIndex *pindex, const CChainParams &chainparams) {
-    return (block.nVersion & SIZE_FORK_VERSION) &&
+    return ((block.nVersion & SIZE_FORK_VERSION) == SIZE_FORK_VERSION) &&
            (pblocktree->ForkActivated(SIZE_FORK_VERSION) == uint256()) &&
            IsSuperMajority(SIZE_FORK_VERSION, pindex, chainparams.GetConsensus().ActivateSizeForkMajority(), chainparams.GetConsensus(), true /* use bitmask */);
 }