Bug 30613: Hide RSS feed link when viewing private list in the OPAC

Bug 30613: Hide RSS feed link when viewing private list in the OPAC

This patch wraps the List RSS icon in a check on whether the list is
public. Private lists RSS can only be accessed by a logged-in patron.

To test apply the patch and view a public list in the OPAC. You should
see an RSS link icon next to the list title.

Now log in to the OPAC and view a private list. There should be no RSS
link.

Note the QA tool warning about the aria-hidden attribute is a false
positive. The parent element has a label.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>