Fix #1279: Fix Gladys Plus backup restore process

[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)
• 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

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[relativeci]

Job #56: Bundle Size — 5.68MB (+0.02%).

cd41112 vs 7f0471e

Changed metrics (2/8)

Metric	Current	Baseline
Initial JS	2.84MB(+0.03%)	2.84MB
Cache Invalidation	49.84%	52.29%

Changed assets by type (1/7)

	Current	Baseline
JS	3.77MB (+0.03%)	3.77MB

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View Job #56 report on app.relative-ci.com

[codecov]

Codecov Report

Merging #1282 (77478bb) into master (7f0471e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1282      +/-   ##
==========================================
+ Coverage   96.52%   96.55%   +0.02%     
==========================================
  Files         669      669              
  Lines        8595     8610      +15     
==========================================
+ Hits         8296     8313      +17     
+ Misses        299      297       -2     

Impacted Files	Coverage Δ
server/lib/gateway/gateway.restoreBackup.js	95.65% <100.00%> (+3.98%)	⬆️
server/lib/system/system.shutdown.js	100.00% <100.00%> (+66.66%)	⬆️

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