fix(trezor-client): fix convert_signature invalid s conversion

[TuDo1403]

Description:

• This PR fixes Invalid convert_signature function in trezor-client Package

Problem:

The current implementation of the convert_signature function in the trezor-client package contains a potential error in the way the signature's s component is handled. Specifically, the line:

let s = resp.signature_r().try_into().map_err(|_| Error::MalformedSignature)?;

This line incorrectly references resp.signature_r() instead of resp.signature_s(), leading to a logical error where the r component is duplicated as s.

Please review the changes and merge them if they meet the project's standards. Thank you for considering this fix.

[prusnak]

https://crates.io/crates/trezor-client/0.1.4 with the change released