pgsql: Fix bug in PostgresNode::query_hash's split() call.

Fix bug in PostgresNode::query_hash's split() call.

By default, Perl's split() function drops trailing empty fields,
which is not what we want here. Oversight in commit fb093e4cb.
We'd managed to miss it thus far thanks to the very limited usage
of this function.

Discussion: /messages/by-id/14837.1499029831@sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/efdb4f29ba9ecbddb74d3a68577f068cf034c540

Modified Files
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src/test/perl/PostgresNode.pm | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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