pgsql: Have psql output tab as the proper number of spaces, rather than

Log Message:
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Have psql output tab as the proper number of spaces, rather than \x09.

Modified Files:
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pgsql/src/bin/psql:
mbprint.c (r1.31 -> r1.32)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/mbprint.c?r1=1.31&r2=1.32)
pgsql/src/test/regress/expected:
prepare.out (r1.15 -> r1.16)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/prepare.out?r1=1.15&r2=1.16)