muos-app version
v0.3.0

Describe the bug
Filename sanitation strips paths and breaks m3u's for multidisc roms using the 'hidden_folder' feature.

To Reproduce
Steps to reproduce the behavior:

1. Go to rom containing multiple discs/tracks
2. Download
3. Try to launch with m3u file
4. Examine files and see they are named '.hidden_ROM_NAME' in the main folder instead of being extracted into folder named '.hidden/.'

Expected behavior
Files should be extracted without 'sanitizing' path info. Perhaps remove '/' from char list.

Screenshots
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System (please complete the following information):

• muOS version: 2502.0 PIXIE
• device: Anbernic RG35XXH
• RomM version: 3.8.1

Additional context
Add any other context about the problem here.