Set post_logout_redirect_uri independently of access_token existence

[zlojic]

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[zlojic]

@stevenmaguire @mstefan21 @settermjd
Kindly review this PR.
post_logout_redirect_uri has been set outside the
if (isset($options['access_token']) === true) condition.
The post_logout_redirect_uri should not depend on the existence of an access token.