chore: merge round 2 fixes (tests)

# Conflicts:
#	install.ps1
#	install.py
#	install.sh

scripts/dedup.py

@@ -301,7 +301,6 @@ def deduplicate(bios_dir: str, dry_run: bool = False) -> dict:
     if not dry_run and empty_cleaned:
         print(f"Cleaned {empty_cleaned} empty directories")
 
-    # Write MAME clone mapping
     if mame_clones:
         # A group is only visible while both copies are on disk, and this run
         # has just deleted the clone. Writing only what was seen this time