fix(core): fixed subdocument remove issue

config/lib/cron-job.js

@@ -177,7 +177,7 @@ function removeGhostPeers() {
                 $pull: {_peers: p._id}
               }).exec();
 
-              p.remove().exec();
+              p.remove();
             });
 
             logger.info(chalk.green('removed ghost peers: ' + count));

modules/torrents/server/controllers/subtitles.server.controller.js

@@ -154,7 +154,7 @@ exports.delete = function (req, res) {
       //}).exec();
       torrent._subtitles.pull(r._id);
 
-      r.remove().exec();
+      r.remove();
 
       res.json(torrent);
 

modules/torrents/server/controllers/torrents.server.controller.js

@@ -964,7 +964,7 @@ function removeTorrentHnRWarning(tid, removeComplete) {
             c.removeHnRWarning(c.user);
           }
           if (removeComplete) {
-            c.remove().exec();
+            c.remove();
           }
         });
       }