Make contrib/test_decoding regression tests safe for CZ locale.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 89c2d81438da2e0bc66ed819769748d58f03a489
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-11-22T01:39:28Z
Releases: 9.5.6
Make contrib/test_decoding regression tests safe for CZ locale.

A little COLLATE "C" goes a long way.

Pavel Stehule, per suggestion from Craig Ringer

Discussion: <CAFj8pRA8nJZcozgxN=RMSqMmKuHVOkcGAAKPKdFeiMWGDSUDLA@mail.gmail.com>

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