Fix test failure on galera_var_reject_queries.

mysql-test/suite/galera/disabled.def

@@ -49,4 +49,4 @@ galera_suspend_slave : MDEV-13549 Galera test failures 10.1
 galera_gtid : MDEV-13549 Galera test failures 10.1
 galera_gtid_slave : MDEV-13549 Galera test failures 10.1
 galera_unicode_identifiers : MDEV-13549 Galera test failures 10.1
-galera_var_reject_queries : MW-245 FIXME: fails on buildbot
+galera.galera_gcs_fc_limit : MDEV-13549 Galera test failures 10.1

mysql-test/suite/galera/t/galera_var_reject_queries.test

@@ -23,7 +23,7 @@ SELECT * FROM t1;
 SET GLOBAL wsrep_reject_queries = ALL_KILL;
 
 --connection node_1a
---error ER_CONNECTION_KILLED,2013
+--error ER_CONNECTION_KILLED,2013,2006
 SELECT * FROM t1;
 
 --connect node_1b, 127.0.0.1, root, , test, $NODE_MYPORT_1