Enable some extra lints for compass app client (#2560)

Enable a few more lints that were mostly followed already for
consistency.

compass_app/app/lib/data/services/api/api_client.dart

@@ -22,7 +22,7 @@ class ApiClient {
     HttpClient Function()? clientFactory,
   })  : _host = host ?? 'localhost',
         _port = port ?? 8080,
-        _clientFactory = clientFactory ?? (() => HttpClient());
+        _clientFactory = clientFactory ?? HttpClient.new;
 
   final String _host;
   final int _port;