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fix(iota): fix signing with ledger nano (#8506)

# Description of change

Fix signing with a ledger nano hardware wallet, currently fails with
`signature error: sign_secure is not supported for external type:
ledger`, broke in https://github.com/iotaledger/iota/pull/7881

## How the change has been tested

` ./run_speculos.sh` in https://github.com/iotaledger/ledger-app-iota
Normal tx:
`LEDGER_SIMULATOR=1 cargo run client pay-iota --recipients
0x<a class=hub.com/iotaledger/iota/commit/1b3669e321893ee49c387a08fc251dbfff37cd2a">1b3669e32<a href="https://github.com/iotaledger/iota/commit/75b92834a4f76619be98bd020320ec86a5c422ab">981e6c473a5b2afde19d363e
--amounts 100`

https://explorer.iota.org/txblock/BjfGrQ4JGXdEzsYZqV5gBgAUJzsddv8c6vBfYKaNqaxn?network=devnet
Sponsored tx:
```
LEDGER_SIMULATOR=1 cargo run client ptb \
--make-move-vec "<std::string::String>" "['zero', 'one', 'two']" \
--assign my_string_vec \
--sender @0x<a class="double-link" href="https://github.com/iotaledger/iota/commit/111111111504e9350e635d65cd38ccd2c029434c">111111111</a>6a3a480d8947a9ba6a15b215 \
--gas-sponsor @0x1b3669e321893ee49c387a08fc251dbfff37cd2a981e6c473a5b2afde19d363e
```

https://explorer.iota.org/txblock/BRVK4bHAcdtH5ZR4oY1vTo2q1vNvSG9CgNA68iYmeycS?network=devnet

### Release Notes

- [ ] Protocol:
- [ ] Nodes (Validators and Full nodes):
- [ ] Indexer:
- [ ] JSON-RPC:
- [ ] GraphQL:
- [x] CLI: Fix signing with ledger nano hardware wallet
- [ ] Rust SDK:
- [ ] REST API:

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