MQTT: Fix setup page on Firefox

[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 (french forum/english forum) 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

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

[cloudflare-pages]

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Latest commit:	e9e5a50
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Branch Preview URL:	https://fix-mqtt-page-firefox.gladys-plus.pages.dev

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[relativeci]

Job #2439: Bundle Size — 10.03MiB (~+0.01%).

e9e5a50(current) vs a3f5539 master#2435(baseline)

Warning

Bundle contains 3 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 regression

	Current Job #2439	Baseline Job #2435
Initial JS	5.37MiB(~+0.01%)	5.37MiB
Initial CSS	303.21KiB	303.21KiB
Cache Invalidation	53.42%	62.51%
Chunks	51	51
Assets	170	170
Modules	1457	1457
Duplicate Modules	20	20
Duplicate Code	0.78%	0.78%
Packages	124	124
Duplicate Packages	3	3

Bundle size by type   1 change 1 regression

	Current Job #2439	Baseline Job #2435
JS	7.13MiB (~+0.01%)	7.13MiB
IMG	2.46MiB	2.46MiB
CSS	319.71KiB	319.71KiB
Fonts	93.55KiB	93.55KiB
Other	17.53KiB	17.53KiB
HTML	13.58KiB	13.58KiB

---

View job #2439 report View fix-mqtt-page-firefox branch activity View project dashboard

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.38%. Comparing base (a3f5539) to head (e9e5a50).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2046   +/-   ##
=======================================
  Coverage   98.38%   98.38%           
=======================================
  Files         844      844           
  Lines       13743    13743           
=======================================
  Hits        13521    13521           
  Misses        222      222           

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