Fix broken tests #476
Description
The following tests are broken after #454 and should be fixed:
FAILED tests/winnow/storage/test_remote_signatures_dao.py::test_save_matches_db[DBRemoteSignaturesDAO] - AttributeError: 'DBRemoteSignaturesDAO' object has no attribute 'save_matches'
FAILED tests/winnow/storage/test_remote_signatures_dao.py::test_save_matches_db[ReprRemoteSignaturesDAO] - AttributeError: 'ReprRemoteSignaturesDAO' object has no attribute 'save_matches'
FAILED tests/general_tests.py::test_extract_frame_level_features - AttributeE...
FAILED tests/general_tests.py::test_extract_video_level_features - AttributeE...
FAILED tests/general_tests.py::test_extract_video_signatures - AttributeError...
FAILED tests/general_tests.py::test_signatures_are_saved - AttributeError: 'P...