style(userfront): apply dart format

userfront/lib/core/services/auth_token_store_backend.dart

@@ -8,11 +8,7 @@ class AuthTokenStoreBackend {
   AuthTokenStoreBackend({
     required AuthTokenStorageTarget localTarget,
     required AuthTokenStorageTarget sessionTarget,
-  }) : _targets = [
-         localTarget,
-         sessionTarget,
-         _MemoryStorageTarget(),
-       ];
+  }) : _targets = [localTarget, sessionTarget, _MemoryStorageTarget()];
 
   static const _tokenKey = 'baron_auth_token';
   static const _providerKey = 'baron_auth_provider';