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
Carey Metcalfe
f2eea89ff0