Theming: The shutdown confirmation dialog ignores theme configuration

[bernig]

Checklist

• I am reporting a bug in the Onion OS - Any issues with the closed source frontend (MainUI), or RetroArch or any of the cores should be directed to their respective repositories
• I have reviewed the Onion Wiki and did not find the answer
• I have searched the existing (open and closed) issues to ensure I do not log a duplicate

Onions OS Version

4.2.0-RC

Miyoo Firmware Version

202303262339

Provide a clear and concise description of the issue

The shutdown dialog ignores the theme's configuration: the A & B action text (OK and Cancel) is black, with the default font. The problem is that on dark themes, the text is invisible.

Screenshot here

Steps to Reproduce

Apply a dark theme (for instance: Wasteland), go to Settings > Shutdown.

Provide any additional context or information that may help us investigate your issue

If this is related to Main UI, I will move this to the correct repository, but I don't know if that is the case.

[Aemiii91]

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