Convert Sonoff buttons to v2 quirk

[TheJulianJES]

Proposed change

This converts both existing Sonoff button quirks to a combined v2 quirk. This way we can avoid adding other signature variations. The "signature match test" is also removed, as it doesn't make much sense with a v2 quirk(?)

Additional information

Also addresses https://github.com/home-assistant/core/issues/104548#issuecomment-2004994990

Checklist

• [ ] The changes are tested and work correctly
• [x] pre-commit checks pass / the code has been formatted using Black
• [ ] Tests have been added to verify that the new code works