fix #6943: ui: network selector: show comments of IPv6 entries

When an interface has an IPv6 address, the selector adds a separate
entry for it and takes the comment from the 'comments6' property.
The API never returns that property: since pve-common commit f2ac9dd
("fix #3153: INotify: adding comment of interface to inet6 section when
this is the only section") the parser merges the inet6 comments into
'comments'.

As a result, the comment of IPv6-only interfaces was dropped, and the
IPv6 entry of dual-stack interfaces had no comment at all, for example
when selecting corosync links or the Ceph networks.

Just keep the 'comments' value, which is already present on the record
or on its copy.

Signed-off-by: Michal Fox <me@dualfroz.com>
Link: https://lore.proxmox.com/20260929140710.2823699-1-me@dualfroz.com

src/form/NetworkSelector.js

@@ -82,8 +82,6 @@ Ext.define('Proxmox.form.NetworkSelector', {
                             dest.data.cidr = record.data.cidr6;
                             dest.data.address = record.data.address6;
                             delete record.data.cidr6;
-                            dest.data.comments = record.data.comments6;
-                            delete record.data.comments6;
                             store.add(dest);
                         }
                     });