bitcoin-tx: rbfoptin: Avoid touching nSequence if the value is already opting in

src/bitcoin-tx.cpp

@@ -216,8 +216,10 @@ static void MutateTxRBFOptIn(CMutableTransaction& tx, const std::string& strInId
     int cnt = 0;
     for (CTxIn& txin : tx.vin) {
         if (strInIdx == "" || cnt == inIdx) {
+            if (txin.nSequence > MAX_BIP125_RBF_SEQUENCE) {
                 txin.nSequence = MAX_BIP125_RBF_SEQUENCE;
             }
+        }
         ++cnt;
     }
 }