Update Lutron in callback

[joostlek]

Proposed change

Update Lutron in callback to increase code quality

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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• The code change is tested and works locally.
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[home-assistant]

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

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[wilburCforce]

If you don't call last_level you may not be getting the right value. State is easily lost in a lutron system due to how the updates flow related to scenes. I strongly discourage this approach as this has been stable for a long time now.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[MartinHjelmare]

Looks good!

@wilburCforce are your concerns settled now?