MAPG-191 don't create separate variable for data where not necessary

src/Controller/MapsController.php

@@ -46,8 +46,10 @@ class MapsController
         }
 
         $user = $this->request->user();
-        $data = ['maps' => $maps, 'isAdmin' => $user !== null && $user->hasPermission(IUser::PERMISSION_ADMIN)];
-        return new HtmlContent('maps', $data);
+        return new HtmlContent('maps', [
+            'maps' => $maps,
+            'isAdmin' => $user !== null && $user->hasPermission(IUser::PERMISSION_ADMIN)
+        ]);
     }
 
     private function formatMapAreaForHuman(float $area): array