MAPG-199 fix issues found by PHPStan

src/Controller/GameController.php

@@ -32,7 +32,7 @@ class GameController
         return new JsonContent($this->prepareGame($mapId));
     }
 
-    private function prepareGame(int $mapId)
+    private function prepareGame(int $mapId): array
     {
         $map = $this->mapRepository->getById($mapId);
 

src/Controller/GameFlowController.php

@@ -128,7 +128,7 @@ class GameFlowController
         ]);
     }
 
-    private function addNewRoundToState(&$state, Place $place, array $placesWithoutPano): void
+    private function addNewRoundToState(array &$state, Place $place, array $placesWithoutPano): void
     {
         $state['rounds'][] = [
             'placesWithoutPano' => $placesWithoutPano,

src/Controller/MapAdminController.php

@@ -161,7 +161,7 @@ class MapAdminController implements ISecured
         return new JsonContent(['mapId' => $map->getId(), 'added' => $addedIds]);
     }
 
-    public function deleteMap()
+    public function deleteMap(): IContent
     {
         $mapId = (int) $this->request->query('mapId');
 

src/Controller/UserController.php

@@ -210,7 +210,7 @@ class UserController implements ISecured
         return new JsonContent(['success' => true]);
     }
 
-    private function confirmUserIdentity(User $user, ?DateTime $authenticatedWithGoogleUntil, ?string $password, &$error): bool
+    private function confirmUserIdentity(User $user, ?DateTime $authenticatedWithGoogleUntil, ?string $password, string &$error): bool
     {
         if ($authenticatedWithGoogleUntil !== null && $authenticatedWithGoogleUntil > new DateTime()) {
             return true;