GH-112 : Redirects back to login page after clicking login button

[elifvish]

Description

Issue

• nonce verification failure when user visited wp-login.php with reauth=1 query arg.

• cause

• reauth=1 forces user for re-authentication even when wordpressp_logged_in cookie is set. Thus when nonce is
  generated for google-api query arguments user_id is present. While during nonce verification user_id is not present resulting in different nonce. Hence the failure.

Fix

• Redirect to wp-login.php if the above scenario occurs before rendering the button.

ref.

• 112

[github-actions[bot]]

Code coverage report: https://gh-reports.rt.gw/login-with-google/refs/pull/125/merge/

[aviral-mittal]

@milindmore22 Requesting to please review this.

[aviral-mittal]

@elifvish This can now be merged I believe