fix: crash dismissPresentedViewController - WPB-15345

[netbe]

WPB-15345 [iOS] Crash dismissPresentedViewController

Issue

There's a crash on production app, when we try to dismiss the presentedViewController. It happens because SplitViewController is nil and it's a implicitly unwrapped value.

Testing

I couldn't have it repoduced, so I mainly avoid the crash for now.

Also looking at the stacktrace, I haven't been able to link openFileMessage(:) to dismissPresentedViewController

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Checklist

• Title contains a reference JIRA issue number like [WPB-XXX].
• Description is filled and free of optional paragraphs.
• Adds/updates automated tests.

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UI accessibility checklist

If your PR includes UI changes, please utilize this checklist:

• Make sure you use the API for UI elements that support large fonts.
• All colors are taken from WireDesign.ColorTheme or constructed using WireDesign.BaseColorPalette.
• New UI elements have Accessibility strings for VoiceOver.

[github-actions]

Test Results

 1 files   9 suites   16s ⏱️
74 tests 73 ✅ 1 💤 0 ❌
75 runs  74 ✅ 1 💤 0 ❌

Results for commit daf57da.

♻️ This comment has been updated with latest results.

[datadog-wireapp]

Datadog Report

Branch report: fix/Crash-dismissPresentedViewController-WPB-15345
Commit report: 04602f5
Test service: wire-ios-mono

✅ 0 Failed, 69 Passed, 1 Skipped, 10.84s Total Time