pgsql: Print the actual DB encoding in the unaccent regression test.

Log Message:
-----------
Print the actual DB encoding in the unaccent regression test.
This is to help make it more obvious what the problem is, if the
encoding isn't what the test expects.

Modified Files:
--------------
    pgsql/contrib/unaccent/expected:
        unaccent.out (r1.1 -> r1.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/unaccent/expected/unaccent.out?r1=1.1&r2=1.2)
    pgsql/contrib/unaccent/sql:
        unaccent.sql (r1.1 -> r1.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/unaccent/sql/unaccent.sql?r1=1.1&r2=1.2)