pgsql: Fix thinko in autovacuum's test to skip temp tables: want to skip

Log Message:
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Fix thinko in autovacuum's test to skip temp tables: want to skip any
temp table not only our own process' tables. It's not real important
since vacuum.c will skip temp tables anyway, but might as well make the
code do what it claims to do.

Modified Files:
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pgsql/src/backend/postmaster:
autovacuum.c (r1.10 -> r1.11)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/autovacuum.c.diff?r1=1.10&r2=1.11)