CSHARP-1888: Fix test that was dependent on a different ticket that was not backported.

Author: rstam

tests/MongoDB.Driver.Core.Tests/Core/Configuration/ClusterBuilderTests.cs

@@ -47,7 +47,7 @@ public void CreateServerMonitorFactory_should_return_expected_result(int connect
 
             var serverMonitorConnectionFactory = (BinaryConnectionFactory)result._connectionFactory();
             var serverMonitorConnectionSettings = serverMonitorConnectionFactory._settings();
-            serverMonitorConnectionSettings.Authenticators.Should().HaveCount(0);
+            serverMonitorConnectionSettings.Authenticators.Should().Equal(authenticators);
 
             var serverMonitorStreamFactory = (TcpStreamFactory)serverMonitorConnectionFactory._streamFactory();
             var serverMonitorTcpStreamSettings = serverMonitorStreamFactory._settings();