[BUGFIX] Fix invalid null coalescing fallback to boolean in record list

Resolves: #101480
Related: #101453
Releases: main, 12.4, 11.5
Change-Id: I62e7166a6ceceb6e8c6c0d0aa5393def72c75346
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80219
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Benjamin Franzke <ben@bnf.dev>

typo3/sysext/backend/Classes/Controller/RecordListController.php

@@ -142,7 +142,7 @@ public function mainAction(ServerRequestInterface $request): ResponseInterface
         $dbList->showClipboardActions = true;
         $dbList->disableSingleTableView = $this->modTSconfig['disableSingleTableView'] ?? false;
         $dbList->listOnlyInSingleTableMode = $this->modTSconfig['listOnlyInSingleTableView'] ?? false;
-        $dbList->hideTables = $this->modTSconfig['hideTables'] ?? false;
+        $dbList->hideTables = $this->modTSconfig['hideTables'] ?? '';
         $dbList->hideTranslations = $this->modTSconfig['hideTranslations'] ?? false;
         $dbList->tableTSconfigOverTCA = $this->modTSconfig['table.'] ?? false;
         $dbList->allowedNewTables = GeneralUtility::trimExplode(',', $this->modTSconfig['allowedNewTables'] ?? '', true);