Respect ESPHome ClimateTrait supports_current_temperature

[Omniflux]

Proposed change

Respect ESPHome ClimateTrait supports_current_temperature the same way ClimateTrait supports_current_humidity is.

Currently, when an ESPHome Climate component does not support the current temperature, it reports 0°C which is then converted to 32°F if the unit system is US customary.

Type of change

• [ ] Dependency upgrade
• [x] 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 #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• [x] The code change is tested and works locally.
• [ ] Local tests pass. Your PR cannot be merged unless tests pass
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• [ ] Tests have been added to verify that the new code works.

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• [ ] Documentation added/updated for www.home-assistant.io

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[home-assistant[bot]]

Hey there @ottowinter, @jesserockz, @kbx81, @bdraco, mind taking a look at this pull request as it has been labeled with an integration (esphome) you are listed as a code owner for? Thanks!

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