Use TotalSeconds to set android timeout

Author: mikhailswift

src/ModernHttpClient/iOS/NSUrlSessionHandler.cs

@@ -131,7 +131,7 @@ protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage
             };
 
             if (Timeout != null)
-                rq.TimeoutInterval = Timeout.Value.Seconds;
+                rq.TimeoutInterval = Timeout.Value.TotalSeconds;
 
             var op = session.CreateDataTask(rq);