fix: use config entry runtime_data to get `zwave_js` client

[Snuffy2]

Proposed change

100% of the credit goes to @bikemike

Changes to use config entry runtime_data for zwave.

Type of change

• [ ] Dependency upgrade
• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (which adds functionality)
• [x] 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 #369
• This PR is related to issue:

[firstof9]

One last request would be to format using black. Should be good after that. Thanks @Snuffy2

[Snuffy2]

Gladly, I actually had my auto-formatting turned off and didn't notice.

[firstof9]

@Snuffy2 you tested the changes locally as well ya?

[Snuffy2]

Yes, it is running correctly on my machine without errors.