libosmocore:  Transition to use of 'telnet_init_default'

Replace remaining calls of telnet_init_dynif() by telnet_init_default()

Related: OS#5809
Change-Id: Ie762d0c642021db1a6ef95333cd771351de86845
diff --git a/utils/osmo-ns-dummy.c b/utils/osmo-ns-dummy.c
index e2662a2..890444c 100644
--- a/utils/osmo-ns-dummy.c
+++ b/utils/osmo-ns-dummy.c
@@ -272,8 +272,7 @@
 		fprintf(stderr, "No config file: '%s' Using default config.\n",
 			config_file);
 
-	rc = telnet_init_dynif(ctx, NULL, vty_get_bind_addr(),
-			       vty_port);
+	rc = telnet_init_default(ctx, NULL, vty_port);
 	if (rc < 0) {
 		fprintf(stderr, "Error initializing telnet\n");
 		exit(1);