[BUGFIX] Show correct icon for page types in UserInformationService

The page types section of the Compare User View now
displays the correct record type icon, which is already
resolved from the record type items definition.

Additionally, a fallback is added to prevent
a possible undefined array key warning.

Resolves: #102338
Releases: main, 12.4
Change-Id: I405b1933d01c1691fdcc10c15b323f92757365ed
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81701
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>

typo3/sysext/beuser/Classes/Service/UserInformationService.php

@@ -231,7 +231,7 @@ protected function convert(BackendUserAuthentication $user): array
                 continue;
             }
             $label = $specialItem['label'];
-            $icon = $this->iconFactory->mapRecordTypeToIconIdentifier('pages', ['doktype' => $specialItem['icon']]);
+            $icon = $specialItem['icon'] ?? 'apps-pagetree-page-default';
             $data['pageTypes'][] = ['label' => $label, 'value' => $value, 'icon' => $icon];
         }