MDEV-18021: Galera test galera_sst_mariabackup_table_options fails if AES_CTR is not available

Problem is that if you use bundled yassl AES_CTR is not supported. There is a way to detect that but as we really want to keep this test enabled did not add
skip for missing support. Changed method to AES_CBC as there is no need to
use AES_CTR.

Author: Jan Lindström

mysql-test/include/innodb_encrypt_tables.combinations

@@ -3,12 +3,12 @@ innodb_encrypt_tables=ON
 plugin-load-add=$FILE_KEY_MANAGEMENT_SO
 loose-file-key-management
 loose-file-key-management-filename=$MYSQL_TEST_DIR/std_data/keys.txt
-file-key-management-encryption-algorithm=aes_ctr
+file-key-management-encryption-algorithm=aes_cbc
 
 [clear]
 innodb_encrypt_tables=OFF
 plugin-load-add=$FILE_KEY_MANAGEMENT_SO
 loose-file-key-management
 loose-file-key-management-filename=$MYSQL_TEST_DIR/std_data/keys.txt
-file-key-management-encryption-algorithm=aes_ctr
+file-key-management-encryption-algorithm=aes_cbc