Two approvals when signing a Transaction object

[KillianH]

Describe the bug
When signing a Transaction object and serializing it back to JSON I get two approvals instead of one.

https://github.com/casper-ecosystem/casper-js-sdk/blob/feat-5.0.0/src/types/Transaction.ts#L505

The code add a first approval to the transaction object and another one to the deploy or transactionV1 object.

To Reproduce

Identify if any Prequisites:

Steps to reproduce the behavior:

1. Use sign() or setSignature() from the Transaction Class

Expected behavior
Signing with a single key should add a single approval ?

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context

Add a test to verify the number of approvals
https://github.com/casper-ecosystem/casper-js-sdk/blob/feat-5.0.0/src/types/Transaction.test.ts#L85

Defect Type

• Regression