Increment number of note witness cache

src/wallet/wallet.h

@@ -59,7 +59,7 @@ static const unsigned int MAX_FREE_TRANSACTION_CREATE_SIZE = 1000;
 //  Should be large enough that we can expect not to reorg beyond our cache
 //  unless there is some exceptional network disruption.
 #define _COINBASE_MATURITY 100
-static const unsigned int WITNESS_CACHE_SIZE = _COINBASE_MATURITY+1;
+static const unsigned int WITNESS_CACHE_SIZE = _COINBASE_MATURITY+2;
 
 class CAccountingEntry;
 class CBlockIndex;