pgsql: Fix copy & paste mistake in pg_get_replication_slots().

Fix copy & paste mistake in pg_get_replication_slots().

XLogRecPtr was compared with InvalidTransactionId instead of
InvalidXLogRecPtr. As both are defined to the same value this doesn't
cause any actual problems, but it's still wrong.

Backpatch: 9.4-master, bug was introduced in 9.4

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/d4ad167d9577cca8c75fee329e2765d930e0c29f

Modified Files
--------------
src/backend/replication/slotfuncs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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