MDEV-16944 fix galera tests

followup for 061adae9

mysql-test/suite/galera/t/MDEV-26597.test

@@ -18,7 +18,7 @@ SHOW WARNINGS;
 SET SESSION wsrep_sync_wait = 0;
 --source include/kill_galera.inc
 
---let $start_mysqld_params = ""
+--let $start_mysqld_params =
 --let $_expect_file_name= $MYSQLTEST_VARDIR/tmp/mysqld.2.expect
 --source include/start_mysqld.inc
 

mysql-test/suite/galera/t/MDEV-29142.test

@@ -50,12 +50,12 @@ SET SESSION wsrep_sync_wait = 0;
 --source include/kill_galera.inc
 
 --remove_file $MYSQLTEST_VARDIR/mysqld.1/data/grastate.dat
---let $start_mysqld_params = "--wsrep-new-cluster"
+--let $start_mysqld_params =--wsrep-new-cluster
 --let $_expect_file_name= $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
 --source include/start_mysqld.inc
 
 --connection node_2
---let $start_mysqld_params = ""
+--let $start_mysqld_params =
 --let $_expect_file_name= $MYSQLTEST_VARDIR/tmp/mysqld.2.expect
 --source include/start_mysqld.inc
 

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

@@ -30,7 +30,7 @@
 
 --echo Starting server ...
 --let $restart_noprint=2
---let $start_mysqld_params="--wsrep-new-cluster"
+--let $start_mysqld_params=--wsrep-new-cluster
 --source include/start_mysqld.inc
 --source include/wait_until_ready.inc
 

mysql-test/suite/galera_sr/t/galera_sr_kill_all_norecovery.test

@@ -38,12 +38,12 @@ SET SESSION wsrep_sync_wait = 0;
 --source include/kill_galera.inc
 
 --remove_file $MYSQLTEST_VARDIR/mysqld.1/data/grastate.dat
---let $start_mysqld_params = "--wsrep-new-cluster"
+--let $start_mysqld_params =--wsrep-new-cluster
 --let $_expect_file_name= $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
 --source include/start_mysqld.inc
 
 --connection node_2
---let $start_mysqld_params = ""
+--let $start_mysqld_params =
 --let $_expect_file_name= $MYSQLTEST_VARDIR/tmp/mysqld.2.expect
 --source include/start_mysqld.inc