Remove unneeded NotImplementedError in Volvlo entity

[erwindouna]

Breaking change

Proposed change

Removes an unneeded NotImplementedError, whereas the method has the decorator @abstractmethod.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
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• Breaking change (fix/feature causing existing functionality to break)
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• This PR fixes or closes issue: fixes #
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[home-assistant]

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

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