KolabMailAccess: minor cleanup
KolabMailAccess: minor cleanup

* in kolab_mail_access_query_changed_uids(), pass search expression to
  kolab_mail_access_update_handles_from_infodb()
* in kolab_mail_access_get_handle(), report a non-existing handle as
  "unknown" instead of "not yet known" (debug)

GNOME/evolution-kolab,GNOME/evolution-kolab