[core] Remove some more .Result calls

These ones were right after an 'await' so they are guaranteed to
succeed every time, but for code hygiene it is better to do it
without the .Result call.

src/MonoTorrent/MonoTorrent.Client.Tracker/UdpTracker.cs

@@ -56,9 +56,9 @@ protected override async Task<List<Peer>> DoAnnounceAsync (AnnounceParameters pa
             try {
                 if (ConnectionIdTask == null || LastConnected.Elapsed > TimeSpan.FromMinutes (1))
                     ConnectionIdTask = ConnectAsync ();
-                await ConnectionIdTask;
+                var connectionId = await ConnectionIdTask;
 
-                var message = new AnnounceMessage (DateTime.Now.GetHashCode (), ConnectionIdTask.Result, parameters);
+                var message = new AnnounceMessage (DateTime.Now.GetHashCode (), connectionId, parameters);
                 var announce = (AnnounceResponseMessage) await SendAndReceiveAsync (message);
                 MinUpdateInterval = announce.Interval;
 
@@ -74,10 +74,10 @@ protected override async Task DoScrapeAsync (ScrapeParameters parameters)
             try {
                 if (ConnectionIdTask == null || LastConnected.Elapsed > TimeSpan.FromMinutes (1))
                     ConnectionIdTask = ConnectAsync ();
-                await ConnectionIdTask;
+                var connectionId = await ConnectionIdTask;
 
                 var infohashes = new List<byte[]> { parameters.InfoHash.Hash };
-                var message = new ScrapeMessage (DateTime.Now.GetHashCode (), ConnectionIdTask.Result, infohashes);
+                var message = new ScrapeMessage (DateTime.Now.GetHashCode (), connectionId, infohashes);
                 var response = (ScrapeResponseMessage) await SendAndReceiveAsync (message);
 
                 if (response.Scrapes.Count == 1) {