Stabilize postgres_fdw test

The test fails when RESET statement_timeout takes longer than 10ms.
Avoid the problem by using SET LOCAL instead.

Overall, this test is not ideal: 10ms could be shorter than the time to
have sent the query to the "remote" server, so it's possible that on
some machines this test doesn't actually witness a remote query being
cancelled.  We may want to improve on this someday by using some other
testing technique, but for now it's better than nothing.  I verified
manually that one round of remote cancellation occurs when this runs on
my machine.

Discussion: 
https://postgr.es/m/CAGECzQRsdWnj=yaapcna8d7e1adbxrpbymybqrmpuijr2mp...@mail.gmail.com

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/ecf741cfae0603d1df269d8b799455bbcaef86e7

Modified Files
--------------
contrib/postgres_fdw/expected/postgres_fdw.out | 5 +++--
contrib/postgres_fdw/sql/postgres_fdw.sql      | 5 +++--
2 files changed, 6 insertions(+), 4 deletions(-)

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