Unable to unload a theme loaded via --add-css-theme

[skaffi]

Acknowledgements

• I have checked that there is no other issue describing the same or
  similar problem that I currently have, regardless if it has been
  closed or open.

• This bug affects Discord website.

• This issue is confirmed to be reproducible when WebCord is packaged
  on at least all three latest supported Electron major releases.

• This issue is reproducible in Chrome, Chromium or any
  Chromium-based browser, e.g Brave or Edge (please write in
  Additional Context which browser you have used if it is neither
  Chrome nor unmodified Chromium).

• There are no fixes done to master which resolves this issue.

• My issue describes one of the unstable and/or not fully implemented
  features.

• I have found a workaround to mitigate or temporarily fix this issue
  in affected releases (please write it in Additional context section
  below).

Operating System / Platform

🐧️ Linux

Operating system architecture

x64 (64-bit Intel/AMD)

Electron version

v39.2.1

Application version

v4.12.1

Bug description

I loaded a CSS theme with the file picker, by starting Webcord with --add-css-theme. Turns out, I would prefer not to use it, and I don't want to just replace it with another custom CSS theme.

However, I see no launch argument for unloading CSS themes, or resetting any modifications done with CSS. It doesn't help if I launch with --add-css-theme and simply select "cancel" in the file picker, either. In fact, nothing I've tried seems to works.

Maybe I'm daft, and have overlooked something. Is there an argument I can use, a command I can run, a file I can edit, or a directory I can delete, to go back to running Webcord with unmodified styling?

Additional context

No response