Fix Tado Power and Link binary sensors

[Noltari]

Power and Link aren't converted from strings to booleans by python-tado, so we need to properly parse before assigning the string value to binary sensors.

Proposed change

Properly parse Tado Zone Power and Link binary sensors.
Fixes #46205.

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)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes TADO - sensor.hotwater_power now does the opposite since 2021.2 and moved to binary sensor #46205
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[probot-home-assistant]

Hey there @michaelarnauts, @bdraco, mind taking a look at this pull request as its been labeled with an integration (tado) you are listed as a codeowner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[MartinHjelmare]

Thanks!