playlist:edit saved the playlist without the raw option, so every title
was rebuilt from the API channel name and country instead of being
written back as read. For a stream whose channel is not in the database,
that becomes "undefined (undefined)". playlist:format, playlist:update
and playlist:test already save with { public: false, raw: true }.
playlist:validate decides which streams belong to the selected files by
comparing the raw command-line arguments with the paths returned by
Storage.list(). A path such as ./streams/us.m3u never matches
streams/us.m3u, so the file's own streams are put in the duplicate buffer
and every link is reported as already being in that same file.
Resolve the arguments with getStoragePath(), as playlist:format does.
leoca