mpd: fix fetching mtime in getDirectoryRecursive

getdirectoryrecursive was using mpd_recv_song after a listall
including directories, changed to use mpd_recv_entity instead
(else incorrect mtime reported)

src/mpdpp.cpp

@@ -718,8 +718,10 @@ void Connection::GetDirectoryRecursive(const std::string &directory, SongConsume
 {
 	prechecksNoCommandsList();
 	mpd_send_list_all_meta(m_connection, directory.c_str());
-	while (mpd_song *s = mpd_recv_song(m_connection))
-		f(Song(s));
+	while (mpd_entity *e = mpd_recv_entity(m_connection)) {
+		if (mpd_entity_get_type(e) == MPD_ENTITY_TYPE_SONG)
+			f(Song(mpd_song_dup(mpd_entity_get_song(e))));
+	}
 	mpd_response_finish(m_connection);
 	checkErrors();
 }