Pass transaction header into correct SignatureHash serialization level

We need to indicate whether PHGR or Groth proofs are expected to vjoinsplit,
which is serialized in an inner hash, not the outer hash.

src/script/interpreter.cpp

@@ -1091,7 +1091,7 @@ uint256 GetOutputsHash(const CTransaction& txTo) {
 }
 
 uint256 GetJoinSplitsHash(const CTransaction& txTo) {
-    CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_JOINSPLITS_HASH_PERSONALIZATION);
+    CBLAKE2bWriter ss(SER_GETHASH, static_cast<int>(txTo.GetHeader()), ZCASH_JOINSPLITS_HASH_PERSONALIZATION);
     for (unsigned int n = 0; n < txTo.vjoinsplit.size(); n++) {
         ss << txTo.vjoinsplit[n];
     }
@@ -1165,7 +1165,7 @@ uint256 SignatureHash(
         memcpy(personalization, "ZcashSigHash", 12);
         memcpy(personalization+12, &leConsensusBranchId, 4);
 
-        CBLAKE2bWriter ss(SER_GETHASH, static_cast<int>(txTo.GetHeader()), personalization);
+        CBLAKE2bWriter ss(SER_GETHASH, 0, personalization);
         // Header
         ss << txTo.GetHeader();
         // Version group ID