Fix Homee brightness sensors reporting in percent

[Taraman17]

Proposed change

There are brightness sensors in Homee, that report their value in percent.
Since HA only supports lx for these, we have to work around that - brightness sensors reporting % will get no device_class.

Removed corresponding test, since it is covered by snapshots

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

Additional information

• This PR fixes or closes issue: fixes #
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[MartinHjelmare]

Two questions remain. Otherwise it looks good.

[MartinHjelmare]

One question remaining.

[MartinHjelmare]

Thanks!