Fix Lint/UselessAssignment cop (#27472)

.rubocop_todo.yml

@@ -48,27 +48,6 @@ Lint/UnusedBlockArgument:
     - 'config/initializers/paperclip.rb'
     - 'config/initializers/simple_form.rb'
 
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Lint/UselessAssignment:
-  Exclude:
-    - 'app/services/activitypub/process_status_update_service.rb'
-    - 'config/initializers/3_omniauth.rb'
-    - 'db/migrate/20190511134027_add_silenced_at_suspended_at_to_accounts.rb'
-    - 'db/post_migrate/20190511152737_remove_suspended_silenced_account_fields.rb'
-    - 'spec/controllers/api/v1/favourites_controller_spec.rb'
-    - 'spec/controllers/concerns/account_controller_concern_spec.rb'
-    - 'spec/helpers/jsonld_helper_spec.rb'
-    - 'spec/models/account_spec.rb'
-    - 'spec/models/domain_block_spec.rb'
-    - 'spec/models/status_spec.rb'
-    - 'spec/models/user_spec.rb'
-    - 'spec/models/webauthn_credentials_spec.rb'
-    - 'spec/services/account_search_service_spec.rb'
-    - 'spec/services/post_status_service_spec.rb'
-    - 'spec/services/precompute_feed_service_spec.rb'
-    - 'spec/services/resolve_url_service_spec.rb'
-    - 'spec/views/statuses/show.html.haml_spec.rb'
-
 # Configuration parameters: AllowedMethods, AllowedPatterns, CountRepeatedAttributes.
 Metrics/AbcSize:
   Max: 144