Fix sliding sync proxy login not working after native SS failure

[jmartinesp]

Content

Catch right exception for retrying the HS setup with sliding sync proxy after native sliding sync failed.

Motivation and context

The wrong exception was being caught and the fallback mechanism wasn't properly working.

Tests

• Use a HS without native sliding sync, such as riot.grin.hu.
• Try to log in with the SSS toggle enabled.
• It should work, but using the sliding sync proxy (you can check this in the logs).

Tested devices

• Physical
• Emulator
• OS version(s): 14

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

[bmarty]

LGTM, thanks!

[github-actions]

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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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.67%. Comparing base (7922243) to head (712f11b).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3489   +/-   ##
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  Coverage    82.67%   82.67%           
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  Files         1731     1731           
  Lines        40841    40841           
  Branches      4968     4968           
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  Hits         33764    33764           
  Misses        5315     5315           
  Partials      1762     1762           

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