Merge bitcoin#20760: test: Set correct nValue for multi-op-return policy check

fad140e test: Set correct nValue for multi-op-return policy check (MarcoFalke)

Pull request description:

  `CTxOut::nValue` is default-initialized to `-1`. The dust-threshold for `OP_RETURN` outputs is `0`. Thus, the policy failure would be `dust` instead of `multi-op-return`. The test only passes because the dust check is currently not run.

  Avoid that confusion by setting the value to `0`, to ensure the dust check passes.

ACKs for top commit:
  theStack:
    ACK fad140e

Tree-SHA512: f0c7a68eb2c573d6595b2b129fa8fa2a34fa35c17691f448bf1c54ccf66059c37562e7480cde7b51c4de677038d7717873da4257147a5f60acc8bbcd25fb7e3f

Author: MarcoFalke

src/test/transaction_tests.cpp

@@ -762,7 +762,9 @@ BOOST_AUTO_TEST_CASE(test_IsStandard)
     // Only one TxoutType::NULL_DATA permitted in all cases
     t.vout.resize(2);
     t.vout[0].scriptPubKey = CScript() << OP_RETURN << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38");
+    t.vout[0].nValue = 0;
     t.vout[1].scriptPubKey = CScript() << OP_RETURN << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38");
+    t.vout[1].nValue = 0;
     reason.clear();
     BOOST_CHECK(!IsStandardTx(CTransaction(t), reason));
     BOOST_CHECK_EQUAL(reason, "multi-op-return");