bg3: tolerate dangling Wine-prefix symlinks in metadata dirs

When the BG3 metadata path (e.g. AppData/Local/Larian Studios) is a
symlink left over from a previous prefix setup that points at a Steam
compatdata path which no longer resolves, pathlib's
mkdir(parents=True, exist_ok=True) raises FileExistsError — exist_ok
only suppresses the error when the path is an actual directory, and a
dangling symlink fails is_dir(). The launch crashed in
bg3_file_mapper.create_mapping before any mods were deployed.

Walk the path top-down on FileExistsError. For each component that's a
dangling symlink, resolve its target via os.path.realpath and create
the directory there so the symlink becomes valid and the original
mkdir succeeds. Cross-prefix sharing (the reason these symlinks exist)
is preserved.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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