vty: use install_lib_element() and install_lib_element_ve()

See https://lists.osmocom.org/pipermail/openbsc/2020-October/013278.html.

Change-Id: Ic541126ffd4975daf87199abfafb465e2055e44f
Related: SYS#4937
diff --git a/src/vty/fsm_vty.c b/src/vty/fsm_vty.c
index 9bde241..3169ee7 100644
--- a/src/vty/fsm_vty.c
+++ b/src/vty/fsm_vty.c
@@ -196,9 +196,9 @@
 	if (osmo_fsm_vty_cmds_installed)
 		return;
 
-	install_element_ve(&show_fsm_cmd);
-	install_element_ve(&show_fsms_cmd);
-	install_element_ve(&show_fsm_inst_cmd);
-	install_element_ve(&show_fsm_insts_cmd);
+	install_lib_element_ve(&show_fsm_cmd);
+	install_lib_element_ve(&show_fsms_cmd);
+	install_lib_element_ve(&show_fsm_inst_cmd);
+	install_lib_element_ve(&show_fsm_insts_cmd);
 	osmo_fsm_vty_cmds_installed = true;
 }