[google_sign_in] Android requestScopes method does not properly clear state in some cases.

[emerssso]

Steps to Reproduce

Environment: Android.

1. Call GoogleSignIn#reqeustScopes() when no user is signed in or with scopes that are already granted.
2. Call any methods on GoogleSignIn. PlatformException is thrown indicating a method is already in progress.

Fix: flutter/plugins#2702

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.