Fixes the Fatal icon text so it's readable in Dark Mode.

[readingdancer]

Prerequisites

• I have added steps to test this contribution in the description below

Issue 18374

Description

• Open up Umbraco 15
• Navigate to Settings
• Navigate to Log Viewer
• Open one of the detailed logs, like "All"
• Change your Umbraco settings to use "Dark Mode"

If you are using the client project, you should see a "Fatal" error icon and the text is too dark to be able to read, dark grey on black.

This PR fixes that :)

[github-actions]

Hi there @readingdancer, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
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• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
• If this is a new feature, Umbraco HQ provided guidance on the implementation beforehand
• 💡 The contribution looks original and the contributor is presumably allowed to share it

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If you realize that you might want to make some changes then you can do that by adding new commits to the branch you created for this work and pushing new commits. They should then automatically show up as updates to this pull request.

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[nielslyngsoe]

Very good, thanks for the attention