Trx abort does not work in autocommit mode

In Galera cluster, a local transaction could be aborted on the node if it conflicts with a remote transaction (higher priority). During code inspection, it was found that ha_abort_transaction() (function responsible for transaction abort) only looked for engines registered under standard transaction (st_transactions::all, and not statement transaction st_transactions::stmt). Thus, a node won't be able to abort a transaction executing in autocommit mode.