Replace device in the right poll frequency array when updated

[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 you are adding a new features/services, did you run integration comparator? (npm run compare-translations on front)
• Did you test this pull request in real life? With real devices? If this development is a big feature or a new service, we recommend that you provide a Docker image to the community for testing before merging.
• 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.js) 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

Fix bug when updating a device, it would be added multiple time to the poll array

[Pierre-Gilles]

@atrovato Found a bug while investigating on this, if you save multiple time a device, it's added multiple time to the array of devices! Example on the camera integration, if I rename my camera, my camera will be poll multiple time in a row !

[relativeci]

Job #238: Bundle Size — 6.73MB (0%).

ee812a2 vs 4644c68

No changes

---

View Job #238 report on app.relative-ci.com

[codecov]

Codecov Report

Merging #1470 (9d3b051) into master (31e22b3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1470   +/-   ##
=======================================
  Coverage   96.58%   96.58%           
=======================================
  Files         616      616           
  Lines        8873     8879    +6     
=======================================
+ Hits         8570     8576    +6     
  Misses        303      303           

Impacted Files	Coverage Δ
server/lib/device/device.add.js	100.00% <100.00%> (ø)
server/lib/device/device.create.js	98.48% <100.00%> (+0.04%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 31e22b3...9d3b051. Read the comment docs.

[atrovato]

Nice shot!