Lower max requests of webseeds to real value

`getPipelineLength` adds 2 extra more requests possible to each wire.

In the case of a webseed, if it already has speed, let the webseed handle its real max requests.

lib/torrent.js

@@ -1127,6 +1127,7 @@ Torrent.prototype._request = function (wire, index, hotswap) {
   if (self.bitfield.get(index)) return false
 
   var maxOutstandingRequests = getPipelineLength(wire, PIPELINE_MAX_DURATION)
+  if (isWebSeed && maxOutstandingRequests > 2) maxOutstandingRequests -= 2; // A webseed will handle it's real max requests
   if (numRequests >= maxOutstandingRequests) return false
   // var endGame = (wire.requests.length === 0 && self.store.numMissing < 30)