stop overcounting seeders/leechers

Peers connect to all available trackers by default, so we should not
count them more than once by adding up reported seeds/peers from
individual trackers.

Instead, we use the maximum reported value to get much more realistic
stats. The probability of undercounting because different peers do not
share trackers is very small and much less damaging than massive
overcounting.

src/trg-torrent-model.c

@@ -131,8 +131,8 @@ static void trg_torrent_model_count_peers(TrgTorrentModel *model, GtkTreeIter *i
     for (li = trackersList; li; li = g_list_next(li)) {
         JsonObject *tracker = json_node_get_object((JsonNode *)li->data);
 
-        seeders += tracker_stats_get_seeder_count(tracker);
-        leechers += tracker_stats_get_leecher_count(tracker);
+        seeders = MAX(seeders, tracker_stats_get_seeder_count(tracker));
+        leechers = MAX(leechers, tracker_stats_get_leecher_count(tracker));
         downloads += tracker_stats_get_download_count(tracker);
     }