Fix formatting of test files

tests/unit/test_model_node_info_20.py

tests/unit/test_model_paginated_album_list.py

tests/unit/test_model_paginated_api_mutation_list.py

tests/unit/test_model_paginated_application_list.py

tests/unit/test_model_paginated_artist_with_albums_list.py

tests/unit/test_model_paginated_channel_list.py

tests/unit/test_model_paginated_inbox_item_list.py

tests/unit/test_model_paginated_library_follow_list.py

tests/unit/test_model_paginated_license_list.py

tests/unit/test_model_paginated_listening_list.py

tests/unit/test_model_paginated_manage_actor_list.py

tests/unit/test_model_paginated_manage_album_list.py

tests/unit/test_model_paginated_manage_artist_list.py

tests/unit/test_model_paginated_manage_channel_list.py

tests/unit/test_model_paginated_manage_domain_list.py

.../unit/test_model_paginated_manage_instance_policy_list.py

tests/unit/test_model_paginated_manage_invitation_list.py

tests/unit/test_model_paginated_manage_library_list.py

tests/unit/test_model_paginated_manage_note_list.py

tests/unit/test_model_paginated_manage_report_list.py