Show that certificate is disabled in CertificateDetailsDialog
GnuPG-Bug-ID: 7089
The ticket suggests showing a "Disabled" text next to the "Valid until" string, which I don't find ideal since this information isn't really related to the the validity.
Instead, show a "Status" field, which contains the same value as used for the compliance in the key list. This way, the user sees whether the key is disabled / revoked / expired / certified