fix: redirect regular users to previous URL with forced redirection option

[richard015ar]

Related issue: https://github.com/pressbooks/private/issues/941

This PR fixes the logout redirection behaviour for regular WP users when the Hide the Pressbooks login page. (forced redirection) option enabled.

Bug description

• Log in as an admin through WP flow and on Integrations > SAML2 settings page, enable the Hide the Pressbooks login page. option and save it.
• Go to the network home page (or any other public page as an example).
• Click on Sign Out at the top of the home page.

Expected behaviour

The user is logged out and redirected to the previous page (the Network home page in the test case).

Current behaviour

The user is logged out and redirected to the WP Login page.

Test case

Follow the previous steps, and make sure the behaviour is the expected one.

[codecov[bot]]

Codecov Report

Merging #173 (a4a7c26) into dev (0ef84ac) will increase coverage by 0.14%. The diff coverage is n/a.

Additional details and impacted files

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