net/openldap24-server: Fix CONFLICTS
Error message:
pkg: openldap26-client-2.6.3 conflicts with openldap24-client-2.4.59_4 (installs files into the same place). Problematic file: /usr/local/bin/ldapadd
Approved by: portmgr blanket
(cherry picked from commit f55d9674821ec3f06a1f1286e3ddabb6278363b2)