fix(map): update episode markers query to discard unpublished episodes

namespace App\Controllers;

use App\Entities\Page;

use App\Models\EpisodeModel;

use CodeIgniter\HTTP\ResponseInterface;

    {

        $cacheName = 'episodes_markers';

        if (! ($found = cache($cacheName))) {

            $episodes = (new EpisodeModel())->where('location_geo is not', null)

            $episodes = (new EpisodeModel())

                ->where('`published_at` <= NOW()', null, false)

                ->where('location_geo is not', null)

                ->findAll();

            $found = [];

            foreach ($episodes as $episode) {