fix: nav links missing, due to duplicate page identifiers

[adamzero1]

trafficstars

If you have pages with the same identifier in different stores, you get inconsistent loading of links.

Example Store A CMS PAGE - A CMS PAGE - B Store B CMS PAGE - A CMS PAGE - C

If you configure nav links for Store B, for pages A & C, there is a chance that the collection loads Page A from Store A (and not store B), and then doesn't render the link in the nav.