test_aio: Fix broken error recovery assertions in 001_aio

The three error recovery checks in `test_handle()` used "qr/^|ok$/" to
look for the marker "ok" in psql's output.  '^' matches every string, so
the assertions passed no matter what psql printed.

Spelling the regex correctly as "qr/^ok\|$/" exposed that the explicit
xact case was actually failing, reporting an incorrect "current
transaction is aborted" instead of showing that an AIO handle can be
acquired again after an error.  This is rewritten with a ROLLBACK,
similarly to the subxact counterpart.

While on it, the subxact case had no marker column in its query, so add
one there for consistency, and reformat to use same pattern.

Author: Jelte Fennema-Nio <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 18

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/9d23f862d60854d797dcab40f46b21aff45d4db5

Modified Files
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src/test/modules/test_aio/t/001_aio.pl | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

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