Always display the certificate expiration date on the admin UI

Cellar Door → made their first commit to this issue’s fork.

I've done a quick update which will need testing but shows the status of the cert at all times and only highlights it in error with a warning to renew if it's close to expiration.

Updated to support Pantheon Certs without expiration needing to show.

Committed to 5.x

Automatically closed - issue fixed for 2 weeks with no activity.