pgsql: Fix typo

Fix typo

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/6307fff3586294214e3f256035b82bbba9a9054a

Modified Files
--------------
src/test/regress/expected/collate.linux.utf8.out | 2 +-
src/test/regress/expected/collate.out | 2 +-
src/test/regress/sql/collate.linux.utf8.sql | 2 +-
src/test/regress/sql/collate.sql | 2 +-
4 files changed, 4 insertions(+), 4 deletions(-)