setPhoto wrote ENCODING=BASE64, the vCard 2.1 spelling, inside cards
announced as VERSION:3.0. Strict CardDAV parsers such as Apple Contacts
drop the property, so LDAP directory photos (jpegPhoto) never displayed
on those clients.
Emit TYPE=JPEG;ENCODING=b as of RFC 2426. The parser already accepts
both encodings, and legacy ENCODING=BASE64 cards keep decoding.
https://bugs.sogo.nu/view.php?id=5134
