Update flag to allow output scripts

[Imamah-Zafar]

Update the flag according to latest package upgrade of @scure/btc-signer

[yknl]

Should also update the @scure/btc-signer version in package.json

[msxakk89]

These changes have not resoled the PSBT issues. Using the latest version of the Sats Connect Test App fails to broadcast transaction:

Transaction Failed
Request failed with status code 400

Inspecting raw PSBT transaction shows absence of digital sig:

{
      "txid": "435a438f35d64d27b287d4ba9fdb00911f469f2490cb539bc8f546750c402809",
      "vout": 1,
      "scriptSig": {
        "asm": "",
        "hex": ""
      },
      "sequence": 4294967295
    },
    {
      "txid": "dbcd6eb46be739ec7821d82898a46438020305d529776ef3c4290c63d536fc2c",
      "vout": 1,
      "scriptSig": {
        "asm": "",
        "hex": ""
      },
      "sequence": 4294967295
    }
  ],