fix: DKG Signing Backend

[shekohex]

Summary of changes

• Use the chainId value from the pallet as the one for queueing transactions.
• Fixes the bug introduced by Use transaction queue for DKG/Substrate (fixes #450) #461

Dynamic Transaction

There is an issue with creating dynamic transactions and TypedChainId, for some reason it does not work and returns this error:

Error encoding from dynamic value: Value shape is wrong; expected type ID 49, but got value Value { value: Composite(Named([("name", Value { value: Primitive(String("EVM")), context: () }), ("values", Value { value: Composite(Unnamed([Value { value: Primitive(U128(5001)), context: () }])), context: () })])), context: () }, which could not be coerced into it

Logs

2023-04-20T20:15:04.027954Z ERROR webb_probe: kind: tx_queue, ty: "SUBSTRATE", chain_id: 1081, errored: true, error: Error encoding from dynamic value: Value shape is wrong; expected type ID 49, but got value Value { value: Composite(Named([("name", Value { value: Primitive(String("EVM")), context: () }), ("values", Value { value: Composite(Unnamed([Value { value: Primitive(U128(5001)), context: () }])), context: () })])), context: () }, which could not be coerced into it
    at crates/tx-queue/src/substrate/substrate_tx_queue.rs:140
    in webb_relayer_tx_queue::substrate::substrate_tx_queue::run with node: 1081

What I have tried and did not work

• Value::from_bytes(src_chain_id.encode())
• Value::u128(u128::from(self.src_chain_id.chain_id())

Reference issue to close (if applicable)

• Closes [BUG] Relayer fails to send proposals to the DKG to be signed #474

---

Code Checklist

• Tested
• Documented

[shekohex]

Related Repos and examples:

• https://github.com/paritytech/scale-value
• https://github.com/paritytech/scale-value/blob/f04c1afb244a7ff47208a0b82907a0b6cc9f7e85/src/scale_impls/encode.rs#L392-L402 (This how to encode an enum variant)

[salman01zp]

Closing in favour of #477