Changed download urls

I changed the download urls, because the current way with segments
(having the parameters between slashes) was causing problems with long
encoded urls, since a segment can be no longer than 255 characters. It
was changed to use regular url parameters which have no such limit on
length.

src/Jackett/Startup.cs

@@ -111,7 +111,7 @@ namespace Jackett
 
             config.Routes.MapHttpRoute(
                 name: "download",
-                routeTemplate: "dl/{indexerID}/{apikey}/{path}/t.torrent",
+                routeTemplate: "dl/{indexerID}/{apiKey}",
                 defaults: new { controller = "Download", action = "Download" }
             );