fix: update condition in home controller to redirect to install page

{

    public function index(): RedirectResponse | string

    {

        $connections = \CodeIgniter\Database\Config::getConnections();

        $db = db_connect();

        if ($connections === [] || ! $db->tableExists('podcasts')) {

            // Cannot connect to the database or cannot find the podcasts table

        if ($db->getDatabase() === '' || ! $db->tableExists('podcasts')) {

            // Database connection has not been set or could not find the podcasts table

            // Redirecting to install page because it is likely that Castopod Host has not been installed yet.

            // NB: as base_url wouldn't have been defined here, redirect to install wizard manually

            $route = Services::routes()->reverseRoute('install');