Increase decryption failure grace period

[BillCarsonFr]

Pull Request Checklist

Increase decryption failure grace period as per https://github.com/element-hq/element-meta/issues/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

[codecov[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/element-hq/element-ios/pull/7764/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq) | Coverage Δ | | |---|---|---| | [uitests](https://app.codecov.io/gh/element-hq/element-ios/pull/7764/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq) | `55.05% <ø> (+<0.01%)` | :arrow_up: | | [unittests](https://app.codecov.io/gh/element-hq/element-ios/pull/7764/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq) | `6.05% <50.00%> (-0.17%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=element-hq#carryforward-flags-in-the-pull-request-comment) to find out more.

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