Increase decryption failure grace period

[BillCarsonFr]

Pull Request Checklist

Increase decryption failure grace period as per element-hq/element-meta#2303

• I read the contributing guide
• UI change has been tested on both light and dark themes, in portrait and landscape orientations and on iPhone and iPad simulators
• Accessibility has been taken into account.

• Pull request is based on the develop branch

• Pull request contains a changelog file in ./changelog.d
• You've made a self review of your PR
• Pull request includes screenshots or videos of UI changes
• Pull request includes a sign off

[pixlwave]

LGTM, ideally we would have a changelog for this.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 12.23%. Comparing base (2ec3ae1) to head (a1d59b3).

Files	Patch %	Lines
Riot/Modules/Analytics/DecryptionFailureTracker.m	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7764      +/-   ##
===========================================
- Coverage    12.39%   12.23%   -0.16%     
===========================================
  Files         1650     1650              
  Lines       163861   163861              
  Branches     66390    66371      -19     
===========================================
- Hits         20305    20044     -261     
- Misses      142888   143172     +284     
+ Partials       668      645      -23     

Flag	Coverage Δ
uitests	55.05% <ø> (+<0.01%)	⬆️
unittests	6.05% <50.00%> (-0.17%)	⬇️

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