dlna: simplify search method for associating subtitles with media nodes

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Seems to be some corner cases that are not being handled, so taking a different
approach that should be a little more robust.

Also, changing resources to be served under a subpath:  We've been serving
media at /res?path=%2Fdir%2Ffilename.mp4; change that to be just /r/dir/filename.mp4.
It's cleaner, easier to reason about, and a necessary first step towards just
serving the resources via httplib anyway.

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