contact photo not synced due to changed PHOTO value

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@rfc2822 Newly uploaded contact photos in Nextcloud are not synced anymore, due to a different syntax used for the PHOTO value. Unfortunately I don’t know if DAVx5 is lacking support of this syntax or if it is a problem within Nextcloud. It would be nice if you could comment here.

(1) - Working syntax:

PHOTO;ENCODING=b;TYPE=JPEG:/9j/4AAQSkZJRgA ...

(2) - Failing syntax:

PHOTO;ENCODING=b;TYPE=jpeg;VALUE=URI:/9j/4AAQSkZJRgAB ...