Bug 18980: Add js to dynamically show/hide the Anyone remark

Bug 18980: Add js to dynamically show/hide the Anyone remark

If we we move from Private to Public or vice versa, this should reflect
on the Anyone remark from the first patch.
If we go back to a private list without shares, we should show it.

Handled in a js sub AdjustRemark, triggered by onchange of the category
combo or the permission combo.

Test plan:
[1] Edit a private list without shares in OPAC. Toggle category and/or
    permissions. Is the remark shown or hidden accordingly?
    Note: Include a test with OpacAllowPublicListCreation enabled.
[2] Edit a shared list or public list in staff. Toggle category/permissions.
    You should never see the remark.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>