Improved Z-Wave integration UI

[Pierre-Gilles]

Pull Request check-list

To ensure your Pull Request can be accepted as fast as possible, make sure to review and check all of these items:

• If your changes affects code, did your write the tests?
• Are tests passing? (npm test on both front/server)
• Is the linter passing? (npm run eslint on both front/server)
• Did you run prettier? (npm run prettier on both front/server)
• If your changes modify the API (REST or Node.js), did you modify the API documentation? (Documentation is based on comments in code)
• If you are adding a new features/services which needs explanation, did you modify the user documentation? See the GitHub repo and the website.
• Did you add fake requests data for the demo mode (front/src/config/demo.json) so that the demo website is working without a backend? (if needed) See https://demo.gladysassistant.com.

NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open.

Description of change

Please provide a description of the change here. It's always best with screenshots, so don't hesitate to add some!

[codecov]

Codecov Report

Merging #606 into master will decrease coverage by 0.01%.
The diff coverage is 90%.

@@            Coverage Diff             @@
##           master     #606      +/-   ##
==========================================
- Coverage   91.91%   91.89%   -0.02%     
==========================================
  Files         396      397       +1     
  Lines        4821     4848      +27     
==========================================
+ Hits         4431     4455      +24     
- Misses        390      393       +3

Flag	Coverage Δ
#server	91.89% <90%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
server/utils/constants.js	100% <ø> (ø)	⬆️
server/services/zwave/api/zwave.controller.js	14.28% <0%> (-1.1%)	⬇️
...erver/services/zwave/lib/commands/zwave.addNode.js	100% <100%> (ø)	⬆️
...wave/lib/commands/zwave.cancelControllerCommand.js	100% <100%> (ø)
...er/services/zwave/lib/events/zwave.driverFailed.js	100% <100%> (ø)	⬆️
...er/services/zwave/lib/commands/zwave.removeNode.js	100% <100%> (ø)	⬆️
server/services/zwave/lib/index.js	100% <100%> (ø)	⬆️
...er/services/zwave/lib/commands/zwave.disconnect.js	100% <100%> (ø)	⬆️
...ver/services/zwave/lib/events/zwave.driverReady.js	100% <100%> (ø)	⬆️
...erver/services/zwave/lib/commands/zwave.connect.js	90% <83.33%> (-10%)	⬇️
... and 1 more

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