player: fix watch later config comments when ignoring path

[guidocella]

With --ignore-path-in-watch-later-config, --write-filename-in-watch-later-config still writes the absolute path of files in the comment, even though the hash is calculated from the basename. Make it write the basename to avoid confusion.

Also stop writing redirect entries for parent directories with --ignore-path-in-watch-later-config, both because it's redundant, and because with this patch it would write the basename of directories in the comment, which would be wrong because their hashes are calculated from the absolute paths.

[github-actions[bot]]

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Windows

• mpv-i686-w64-mingw32
• mpv-x86_64-w64-mingw32