System cancels being reported as "unknown errors" rather than cancellation

[mlyrstad]

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There are cancel results, due to iOS actions, which are being reported as "unknown errors" when they should be reported as a form of cancel, so we can act appropriately. The reason for the difference is the need to log eventual actual errors.

Steps to reproduce

1. Let the app open the authentication system on an iPhone (problem reproduced with face-ID and fingerprint)

2. Press the iPhone's "home" button, easiest way is to not use the registered finger, so it doesn't recognize your fingerprint

3. Examine the results

Expected behavior

Should report a cancellation (probably just Canceled?)

Actual behavior

Says "unknown error" => "canceled by the system" or something of the sort

Crashlog

Configuration

Version of the Plugin: e.g. 1.0.0 / 1.0.1-alpha3
2.1.4

Platform: e.g. iOS 10.1 / Android 4.4 / ... (including version!!! e.g. Android 5.1 / i0S 10)
iOS 13.3.1

Device: e.g. HTC Sensation /i Phone 7 ...
iPhone 8 Plus

[smsissuechecker]

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[tranb3r]

This is still not working properly :(