Fix pg_upgrade -O/-o options

Fix previous commit that added synchronous_commit=off, but broke -O/-o
due to missing space in argument passing.

Backpatch to 9.2.

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/35fb1434b185c5e9ee1e232f3349713201e7cbfa

Modified Files
--------------
contrib/pg_upgrade/server.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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