Add more detailed message for videos removed by uploader

[TotalCaesar659]

Checklist

• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
• This issue contains only one feature request. I will open one issue for every feature I want to request.

What feature do you want?

When opening videos removed by uploader (e.g. https://www.youtube.com/watch?v=6f9TCU-rk00), it shows "This video has been removed by the uploader" on PC, but just "Content unavailable" in NewPipe. It would be better to make similar message here.
This issue is kind of a sequel to #4979.

Why do you want this feature?

It will let users know who removed the video (uploader, not YouTube).