Oauth scopes and login issue

Environment

• Installation type (OTP or From Source): OTP
• Pleroma version (could be found in the "Version" tab of settings in Pleroma-FE): Backend Version 2.0.7-stable Frontend Version 5d49edc8

Bug description

If you forget to send the scopes over in the /oauth/authorize endpoint you are only returned a wrong username/password error even if you pass in the correct username and password. It might be helpful to show scopes are needed to be set or allow the users to select them if none are sent over in the scope url param