MDEV-26080 fixup: fixed .result file for galera_roles test (one word must be...

MDEV-26080 fixup: fixed .result file for galera_roles test (one word must be enclosed in single quotes).

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

@@ -26,7 +26,7 @@ connect foo_node_2,127.0.0.1,foo,,test,$port_2,;
 connection foo_node_1;
 SHOW GRANTS;
 Grants for foo@localhost
-GRANT role1 TO 'foo'@'localhost'
+GRANT 'role1' TO 'foo'@'localhost'
 GRANT USAGE ON *.* TO 'foo'@'localhost'
 FLUSH TABLES;
 ERROR 42000: Access denied; you need (at least one of) the RELOAD privilege(s) for this operation
@@ -62,7 +62,7 @@ pr1
 connection foo_node_2;
 SHOW GRANTS;
 Grants for foo@localhost
-GRANT role1 TO 'foo'@'localhost'
+GRANT 'role1' TO 'foo'@'localhost'
 GRANT USAGE ON *.* TO 'foo'@'localhost'
 FLUSH TABLES;
 ERROR 42000: Access denied; you need (at least one of) the RELOAD privilege(s) for this operation