fix: tests

Signed-off-by: Git'Fellow <12234510+solracsf@users.noreply.github.com>

Author: solracsf

tests/Folder/FolderManagerTest.php

@@ -115,7 +115,7 @@ private function seedFilecacheForFolder(int $folderId): void {
 				'permissions' => $insert->createNamedParameter(0, IQueryBuilder::PARAM_INT),
 			]);
 		$insert->executeStatement();
-		$filecacheId = $db->lastInsertId('*PREFIX*filecache');
+		$filecacheId = $insert->getLastInsertId();
 
 		$update = $db->getQueryBuilder();
 		$update->update('group_folders')