LDAP_AUTH_CLEAN_USER_DATA does not receive all values for multi-valued fields

[Freddo3000]

https://github.com/etianen/django-python3-ldap/blob/82858594a1f77849aa0ce15ffc4755d7f9b5e610/django_python3_ldap/ldap.py#L48-L57

I'm trying to use the labeledURI field to store additional data about users as a list, however the above code removes all but the first value before any processing via LDAP_AUTH_CLEAN_USER_DATA can be made.