Update hub.py

[stevendodd]

When you add and remove devices from the hub the hub can return more than the total devices..

Context

Proposed change

Type of change

• [ ] Dependency upgrade
• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New device
• [ ] New product id (the device is already supported with a different id)
• [ ] New feature (which adds functionality to an existing device)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [ ] Code quality improvements to existing code or addition of tests
• [ ] Documentation

Additional information

• This PR fixes issue: fixes #
• This PR is related to:
• Link to documentation pull request:

Checklist

• [x] The code change is tested and works locally.
• [ ] The code has been formatted using Black.
• [ ] The code follows the Zen of Python.
• [ ] I am creating the Pull Request against the correct branch.
• [ ] Documentation added/updated.

[felipediel]

Thank you @stevendodd! It seems that the dids end up being duplicated when the order changes. How about we add a filter to avoid extending sub_devices with duplicate dids?

[felipediel]

Closed with https://github.com/mjg59/python-broadlink/pull/790. Thanks @stevendodd!