Allow unicode chars in "Exclude from scan" entries

[Adios]

Is your feature request related to a problem? Please describe.
In the GUI scan window, Exclude from scan is useful for duplicates that I want to keep.

But it currently doesn't support unicode input.

If input is not ascii, an error will be shown¹:

scan 'ascii' codec can't encode characters in position NN-NN: ordinal not in range(128)

Describe the solution you'd like
It's good to have it support unicode string.

Additional context
Tested on Dude-Nuitka Release v1.0361.446

---

Footnotes

1. screenshot: https://github.com/PJDude/dude/assets/62105/ed75f4e3-8d21-49e5-9848-a77a4f57f77c ↩

[PJDude]

Fixed on v1.0371.550
Thanks for Your time.