fix: send filters to new clients

NostrServices/Services/NostrListener.cs

@@ -51,6 +51,14 @@ public class NostrListener : IDisposable
         {
             _client.RegisterCommunicator(comm);
             comm.Start();
+            var client = _client.FindClient(comm.Name);
+            if (client != default)
+            {
+                foreach (var (k, v) in _subscriptionToFilter)
+                {
+                    client.Send(new NostrRequest(k, v));
+                }
+            }
         }
     }