Fix visually truncated error message in test result for awesome plugin

[evg-fr]

On test result page error message the text is not wrapped resulting in visual truncation (actual text is there, but hidden).
Seems that default styling for <pre> tags doesn't respect text wrapping.

Without fix:

With fix:

[CLAassistant]

All committers have signed the CLA.

[todti]

Hi @evg-fr
Thank you for your contribute but white-space breaks error message and difficult to read error trace here. We use white-space by default for this error messages. If you need some test results you can use sandbox directory just run yarn t inside and you get some allure-results and alllure-report

[evg-fr]

Hello @todti,
It's interesting because in results that we got with NUnit Allure 2.9.5-preview (it's a bit old, but we stuck with it for some time) package we have separate field for stack trace and it shows it with scrollbar preserving line-breaks:

test result json has separate field for stack trace:

I'm a bit confused because there was fix for it: #32