Fix expected output for plpgsql test suite

Fix expected output for plpgsql test suite

Commit 7d55b3a318 accepted incorrect expected output for a number
of tests in this suite. The issue might have been initially masked
by existence of another .out file for this test.

We seem to be producing the correct output, so just use expected
output from upstream. Moreover, the table (INT4_TBL) is defined as
replicated, so we don't need the explicit ORDER BY clauses as the
ordering is stable anyway. So remove them, to make the the tests
a bit closer to upstream.