Fix device_class type for Shelly Gen1 sleeping sensors

[bieniu]

Breaking change

Proposed change

For sleeping Gen1 devices, restored sensors get device_class as a string not as SensorDeviceClass. This change fix this issue.

@bdraco @thecode Thanks for helping with this.

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 Gen 1 shelly devices including but not limited to HT sensor not displaying Fahrenheit only Celsius  #107131
• This PR is related to issue:
• Link to documentation pull request:

Checklist

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[home-assistant]

Hey there @balloob, @thecode, @chemelli74, @bdraco, mind taking a look at this pull request as it has been labeled with an integration (shelly) you are listed as a code owner for? Thanks!

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[chemelli74]

Great job guys!

[thecode]

Thanks!

[bdraco]

Thanks @bieniu