fix: refresh token manually doesn't support scope

[monsignore7]

Description

Currently, when using the manager method "refreshToken" it adds automatically the scope to the request body, but in Salesforce token endpoint the scope param is not supported :/

**EDIT
I saw that manager performs the refresh token by itself and since the methods are the same, the request fails too

Steps To Reproduce

1. Authenticate successfully with the loginAuthorizationCodeFlow method in Salesforce
2. Invalidate access token returned from the login
3. Manual refresh the token with the refreshToken method

Expected Behavior

It should be possible to decide whether or not to include the scope param in request when refreshing token