Tests: record mariabackup.system_versioning [#387]

mysql-test/suite/mariabackup/system_versioning.result

@@ -20,7 +20,7 @@ a
 1
 set global system_versioning_transaction_registry=on;
 Warnings:
-Warning	4144	Transaction-based system versioning is EXPERIMENTAL and is subject to change in future.
+Warning	4143	Transaction-based system versioning is EXPERIMENTAL and is subject to change in future.
 create or replace table t (
 a int,
 s bigint unsigned as row start invisible,