webadmin: Hide "public" InfoIcon if checkbox hidden

In previous patches disregarded the fact that the public checkbox
could be hidden, in which case the InfoIcon should also be hidden.

Change-Id: Ib3dc7a083ca212c7e5dd5e2f2e5ff8b54fa8f573
Bug-Url: https://bugzilla.redhat.com/1000804
Signed-off-by: Lior Vernia <lvernia@redhat.com>