adapt Container usage to new soko-web

src/Repository/MapRepository.php

@@ -4,20 +4,12 @@ use SokoWeb\Database\Query\Select;
 use MapGuesser\PersistentData\Model\Challenge;
 use MapGuesser\PersistentData\Model\Map;
 use MapGuesser\PersistentData\Model\Place;
-use SokoWeb\PersistentData\PersistentDataManager;
 
 class MapRepository
 {
-    private PersistentDataManager $pdm;
-
-    public function __construct()
-    {
-        $this->pdm = new PersistentDataManager();
-    }
-
     public function getById(int $mapId): ?Map
     {
-        return $this->pdm->selectFromDbById($mapId, Map::class);
+        return \Container::$persistentDataManager->selectFromDbById($mapId, Map::class);
     }
 
     public function getByPlace(Place $place): ?Map
@@ -33,6 +25,6 @@ class MapRepository
         $select->where('challenge_id', '=', $challenge->getId());
         $select->limit(1);
 
-        return $this->pdm->selectFromDb($select, Map::class);
+        return \Container::$persistentDataManager->selectFromDb($select, Map::class);
     }
 }