Follow up of T7128.

In the case a secret key is stored on disk and then copied to a smart card without deleting the subkeys on disk, the information given above the certificate details tabs is still "On this computer" and not "On this computer and on a smart card" or "On this computer and on %1 smart cards".

Keep an eye on the decision in T7545: Kleopatra: improve info on private key location in details, as there is the possibility that this task might become obsolete.