MDEV-19926: Galera SST tests fail

Enable after SST script changes.

mysql-test/suite/galera/disabled.def

@@ -18,7 +18,6 @@ galera_as_master_gtid : Requires MySQL GTID
 galera_as_master_gtid_change_master : Requires MySQL GTID
 galera_as_slave_preordered : wsrep-preordered feature not merged to MariaDB
 galera_as_slave_replication_bundle : MDEV-15785 OPTION_GTID_BEGIN is set in Gtid_log_event::do_apply_event()
-galera_autoinc_sst_mariabackup : MDEV-19926 Galera SST tests fail
 galera_binlog_rows_query_log_events: MariaDB does not support binlog_rows_query_log_events
 galera_binlog_stmt_autoinc: MDEV-19959 Galera test failure on galera_binlog_stmt_autoinc
 galera_flush :  MariaDB does not have global.thread_statistics
@@ -27,7 +26,6 @@ galera_ist_mariabackup : MDEV-18829 test leaves port open
 galera_ist_progress : MDEV-15236 fails when trying to read transfer status
 galera_migrate : MariaDB does not support START SLAVE USER
 galera_ssl_upgrade : MDEV-19950 Galera test failure on galera_ssl_upgrade
-galera_sst_mariabackup_encrypt_with_key : MDEV-19926 Galera SST tests fail
 galera_var_node_address : MDEV-20485 Galera test failure on galera.galera_var_node_address
 galera_wan : MDEV-17259 Test failure on galera.galera_wan
 partition : MDEV-19958 Galera test failure on galera.partition