Add domain when clearing cookie

[bunea]

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Description

I ran into a problem when setting the cookieDomain option in the session config. The cookie is set correctly when logging in, but because the domain is missing when clearing the cookie in the logout handler it seems that the cookie is not cleared and I remain logged in. Although if I try logging in again Auth0 presents me with the login page.

It looks like an easy fix to add the cookieDomain when clearing the cookie, but I'm not sure if this is the right approach.

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master