"removed" field is discarded on torrent-get call with "recently-active" for ids

[g-regor]

Calling get_torrents with "recently-active" as ids, only a list of torrents is returned and not the array of removed torrent ids.

From the RPC API spec

If the request's "ids" field was "recently-active", a "removed" array of torrent-id numbers of recently-removed torrents.

The code is acknowledging "recently-active" as a valid value for ids, but the returned "removed" field is ignored.

I think that there should be a method specifically for this kind of rpc call.

[trim21]

Considering a way to add this feature but not breaking current code...