Fix MQTT JSON light not reporting color temp status if color is not supported

[jbouwh]

Proposed change

After #136996 MQTT JSON lights with color_temp only support did not process state color_temp updates correctly. This is fixed.

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 MQTT - Handling of COLOR_TEMP in white spectrum bulbs not working #140072 Not Adding Devices to Scenes Properly #140235
• This PR is related to issue:
• Link to documentation pull request:
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• Link to frontend pull request:

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[home-assistant]

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

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