psql: Improve tab completion of WITH

Only match when WITH is the first word, as WITH may appear in many
other contexts.

Josh Kupershmidt

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/6b8c99c386d318b434829ac0c9ba935fb5e53d18

Modified Files
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src/bin/psql/tab-complete.c |    5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)

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