psql: Remove inappropriate const qualifiers

Since mbvalidate() can alter the string it validates, having the
callers claim that the strings they accept are const is inappropriate.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/598bb8cdbd9c2554bd8acfc51c9fed473a7d37bc

Modified Files
--------------
src/bin/psql/mbprint.c |    2 +-
src/bin/psql/print.c   |    4 ++--
src/bin/psql/print.h   |    4 ++--
3 files changed, 5 insertions(+), 5 deletions(-)

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