MDEV-19950 addendum: galera_ssl_upgrade removed from the list of disabled...

MDEV-19950 addendum: galera_ssl_upgrade removed from the list of disabled tests and adapted for 10.4+

mysql-test/suite/galera/disabled.def

@@ -31,7 +31,6 @@ galera_parallel_simple : MDEV-20318 galera.galera_parallel_simple fails
 galera_pc_ignore_sb : MDEV-20888 galera.galera_pc_ignore_sb
 galera_pc_recovery : MDEV-25199 cluster fails to start up
 galera_shutdown_nonprim : MDEV-21493 galera.galera_shutdown_nonprim
-galera_ssl_upgrade : MDEV-19950 Galera test failure on galera_ssl_upgrade
 galera_toi_ddl_nonconflicting : MDEV-21518 galera.galera_toi_ddl_nonconflicting
 galera_toi_truncate : MDEV-22996 Hang on galera_toi_truncate test case
 galera_var_ignore_apply_errors : MDEV-20451: Lock wait timeout exceeded in galera_var_ignore_apply_errors

mysql-test/suite/galera/r/galera_ssl_upgrade.result

+connection node_2;
+connection node_1;
 connection node_1;
 call mtr.add_suppression("WSREP: write_handler(): protocol is shutdown.*");
 connection node_2;
@@ -24,5 +26,6 @@ connection node_1;
 SELECT VARIABLE_VALUE = 2 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_size';
 VARIABLE_VALUE = 2
 1
+connection node_2;
 disconnect node_2;
 disconnect node_1;