Update leviton-zw6hd.yml to expand range 99->100

[RarbourLeviton]

We are seeing issues when the zwave range is report is 99, the ST app claims it is out of range. All other drivers go to 100 range, so I believe this is the source of the issue, so changing our driver to match

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Type of Change

• WWST Certification Request
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    • I have reviewed the README.md file
    • I have reviewed the CODE_OF_CONDUCT.md file
    • I have signed the CLA
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• X Bug fix
• New feature
• Refactor

Checklist

• X I have performed a self-review of my code
• X I have commented my code in hard-to-understand areas
• X I have verified my changes by testing with a device or have communicated a plan for testing
• I am adding new behavior, such as adding a sub-driver, and have added and run new unit tests to cover the new behavior

Description of Change

Change the max range of z-wave dimmer from 99 to 100

Summary of Completed Tests

[CLAassistant]

All committers have signed the CLA.