
<!-- Describe the issue -->
Following commit 46004790588c24174a0bec49b540d158ce163ffd (@achow101), `decodepsbt` overstates the fee, apparently including both the `witness_utxo` and `non_witness_utxo` amounts in the inputs.

**Expected behavior**

The decoded fee should be the sum of the inputs, minus the sum of the outputs.

**Actual behavior**

The decoded fee is exactly twice the amount of the inputs, minus the sum of the outputs.

**To reproduce**

Build any PSBT using `createpsbt`, `walletprocesspsbt`, then decode it with `decodepsbt`. See the `fee` field in the JSON.

**System information**

I compiled myself from 5550fa5983ea59e7ccef6540b7ec49a1770fb3ca on Whonix 14.

Then I did `git revert 46004790588c24174a0bec49b540d158ce163ffd ` and the problem went away.

{
static const CRPCCommand commands[] =
{ 
  
    { "rawtransactions",    "getrawtransaction",            &getrawtransaction,         {"txid","verbose","blockhash"} },
    { "rawtransactions",    "createrawtransaction",         &createrawtransaction,      {"inputs","outputs","locktime","replaceable"} },
    { "rawtransactions",    "decoderawtransaction",         &decoderawtransaction,      {"hexstring","iswitness"} },
    { "rawtransactions",    "decodescript",                 &decodescript,              {"hexstring"} },
    { "rawtransactions",    "sendrawtransaction",           &sendrawtransaction,        {"hexstring","maxfeerate"} },
    { "rawtransactions",    "combinerawtransaction",        &combinerawtransaction,     {"txs"} },
    { "rawtransactions",    "signrawtransactionwithkey",    &signrawtransactionwithkey, {"hexstring","privkeys","prevtxs","sighashtype"} },
    { "rawtransactions",    "testmempoolaccept",            &testmempoolaccept,         {"rawtxs","maxfeerate"} },
    { "rawtransactions",    "decodepsbt",                   &decodepsbt,                {"psbt"} },
    { "rawtransactions",    "combinepsbt",                  &combinepsbt,               {"txs"} },
    { "rawtransactions",    "finalizepsbt",                 &finalizepsbt,              {"psbt", "extract"} },
    { "rawtransactions",    "createpsbt",                   &createpsbt,                {"inputs","outputs","locktime","replaceable"} },
    { "rawtransactions",    "converttopsbt",                &converttopsbt,             {"hexstring","permitsigdata","iswitness"} },
    { "rawtransactions",    "utxoupdatepsbt",               &utxoupdatepsbt,            {"psbt", "descriptors"} },
    { "rawtransactions",    "joinpsbts",                    &joinpsbts,                 {"txs"} },
    { "rawtransactions",    "analyzepsbt",                  &analyzepsbt,               {"psbt"} },
    { "blockchain",         "gettxoutproof",                &gettxoutproof,             {"txids", "blockhash"} },
    { "blockchain",         "verifytxoutproof",             &verifytxoutproof,          {"proof"} },
};
    for (unsigned int vcidx = 0; vcidx < ARRAYLEN(commands); vcidx++)
        t.appendCommand(commands[vcidx].name, &commands[vcidx]);
}