Remove invalid watts sensor from NUT

[tdfountain]

Proposed change

Remove the "watts" sensor since it is invalid. This appears like a breaking change, but is not actually a breaking change. NUT variables are based on RFC 9271 available at https://www.rfc-editor.org/info/rfc9271 with a complete list of num names at https://github.com/networkupstools/nut/blob/master/docs/nut-names.txt. These variables generally take the form of x.y. The variable name "watts" is not a valid variable name. The sensor is therefore invalid and cannot be used. This PR removes the sensor from sensor.py and the translation from strings.json. It is not listed in icons.json. There are no test cases that reference this invalid sensor.

This is a replacement for PR#140334 which was inadvertently closed.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @bdraco, @ollo69, @pestevez, mind taking a look at this pull request as it has been labeled with an integration (nut) you are listed as a code owner for? Thanks!

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[bdraco]

Thanks @tdfountain

[bdraco]

If it later, turns out to be valid, but I can't see how, we can revert this PR