Add "Portfolio" to the safelist for staff LDAP importing
Stemming from INC1578461
Martha Ney's record has the value "Portfolio" for businessCategory. She is the only member of our staff who has a businessCategory with the value "Portfolio." The UL site is expecting this value to be "UP Department" or "UP Library" or "CCL Library". As per @ful105 we're going to add this to the safelist.