fix missing PermitTTY in RemoteSshdConfig Reset

this fixes a test failure in Common_CreateMoreChannelsThanMaxSessions
when running the tests multiple times against the same SSH server
instance.

see #1704 (comment)

Author: mus65

test/Renci.SshNet.IntegrationTests/Common/RemoteSshdConfigExtensions.cs

@@ -23,6 +23,7 @@ public static void Reset(this RemoteSshdConfig remoteSshdConfig)
                             .ClearHostKeyAlgorithms()
                             .ClearPublicKeyAcceptedAlgorithms()
                             .ClearMessageAuthenticationCodeAlgorithms()
+                            .PermitTTY(true)
                             .WithUsePAM(true)
                             .Update()
                             .Restart();