[BUGFIX] Prevent endless loop in PageLinkBuilder

By re-using an already resolved page #99612 introduced an endless loop
during HMENU/Sitemap rendering: An external page (doktype=3) with a
simple query string like '?showModal=1' resolves to itself over and over
where the current page is the correct target.

Resolves: #100188
Releases: main

Change-Id: If81b558125706bc17dd76adaf91dec4039427121
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78140


Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>