Change type of LuminosityPercentage to int from byte

[demichiel]

The LuminosityPercentage stayed at 0 when initializing the screen on M5StickC Plus.

Description

I couldn't get my display working so debugged it to the setter of the Screen.LuminosityPercentage. This PR changes the type to an int and updates the setter.

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Unit Tests (work on Unit Tests, has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[dnfadmin]

All CLA requirements met.

[Ellerbach]

Thanks a lot for the fix!

[nfbot]

@demichiel thank you again for your contribution! 🙏😄

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