pgsql: Correct value of LW_SHARED_MASK.

Correct value of LW_SHARED_MASK.

The previous wrong value lead to wrong LOCK_DEBUG output, never showing
any shared lock holders.

Reported-By: Alexander Korotkov
Discussion: CAPpHfdsPmWqz9FB0AnxJrwp1=KLF0n=-iB+QvR0Q8GSmpFVdUQ@mail.gmail.com
Backpatch: 9.5, where the bug was introduced.

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/62e503b0c29bbb9e0ac7ebce6990bf3c7c3c9a89

Modified Files
--------------
src/backend/storage/lmgr/lwlock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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