An addition to fix for

BUG#51342 - more xid crashing

Restore autocommit variable by supplying explicit value.

mysql-test/r/xa.result:
  Restore autocommit variable by supplying explicit value.
mysql-test/t/xa.test:
  Restore autocommit variable by supplying explicit value.

mysql-test/r/xa.result

@@ -90,5 +90,5 @@ INSERT INTO t1 VALUES(1);
 XA END 'x';
 XA COMMIT 'x' ONE PHASE;
 DROP TABLE t1;
-SET SESSION autocommit=DEFAULT;
+SET SESSION autocommit=1;
 End of 5.0 tests

mysql-test/t/xa.test

@@ -136,7 +136,7 @@ INSERT INTO t1 VALUES(1);
 XA END 'x';
 XA COMMIT 'x' ONE PHASE;
 DROP TABLE t1;
-SET SESSION autocommit=DEFAULT;
+SET SESSION autocommit=1;
 
 --echo End of 5.0 tests