Only refresh non-revoked user IDs with email addresses via WKD

Previously, we passed all user IDs to the WKD refresh job (if WKD update
is enabled for all user IDs). The job then filtered out all revoked
user IDs and all user IDs without email address and did nothing for
keys without non-revoked user IDs with email addresses. This lead to
the bogus result message that the key(s) were updated via WKD.

• GnuPG-bug-id: T7190