rename invisible flag to onlySignedDeviceIsolation flag

[BillCarsonFr]

Fixes #3528

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Motivation and context

Screenshots / GIFs

Tests

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Tested devices

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Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.62%. Comparing base (fdd0a0d) to head (10014d3).
Report is 9 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3542   +/-   ##
========================================
  Coverage    82.62%   82.62%           
========================================
  Files         1732     1732           
  Lines        40939    40939           
  Branches      4980     4980           
========================================
  Hits         33827    33827           
  Misses        5343     5343           
  Partials      1769     1769           

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud