MDEV-21842 auto_increment does not increment with compound primary key on partitioned table.

The idea of this fix is that it's enough to prevent the
next_auto_inc_val from incrementing if an error, to fix this problem
and also the MDEV-17333.
So this patch basically reverts the existing fix to the MDEV-17333.

mysql-test/main/partition_innodb.result

@@ -1046,10 +1046,10 @@ INSERT INTO t1 VALUES ();
 SELECT * FROM t1;
 a
 -1
-1
 3
 4
 6
+7
 DROP TABLE t1;
 #
 # End of 10.3 tests