Fix pagination for DLNA root folder list

Previously, when responding to a DLNA "Browse" request, the
`StartingIndex` was not respected and all of the root items were
returned each time. This caused infinite loops with in DLNA clients that
ignored the `TotalMatches` data in the response and just continued
asking for the next page until they got an empty response.

This fix makes the root folder list respect the `StartingIndex` and
`RequestedCount` parameters like all other responses.

Fixes issue #2303

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