adapt $withRelations usage to soko-web 0.7

src/Controller/MapAdminController.php

@@ -218,7 +218,7 @@ class MapAdminController implements IAuthenticationRequired, ISecured
             \Container::$persistentDataManager->deleteFromDb($userInChallenge);
         }
 
-        foreach ($this->guessRepository->getAllInChallenge($challenge, [PlaceInChallenge::class]) as $guess) {
+        foreach ($this->guessRepository->getAllInChallenge($challenge, ['place_in_challange']) as $guess) {
             \Container::$persistentDataManager->deleteFromDb($guess);
         }