pgsql: Disable multi-byte citext tests

Disable multi-byte citext tests

This reverts commit 890faaf1 which attempted unsuccessfully to deal with
the problem, and instead just comments out these tests like other similar
tests elsewhere in the script.

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d1687c6926819f023c78b353458950a303796aba

Modified Files
--------------
contrib/citext/expected/citext.out | 32 ++++++--------------------------
contrib/citext/expected/citext_1.out | 32 ++++++--------------------------
contrib/citext/sql/citext.sql | 14 +++++++-------
3 files changed, 19 insertions(+), 59 deletions(-)

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