Fix instability with WAL fsync test in stats.sql

A backend using wal_sync_method set to "open_sync" or "open_datasync"
would fail the test checking the WAL sync data in pg_stat_io.  These
modes guarantee that a sync is done when WAL is written to disk, and the
data checked by the test is not incremented in this case,
issue_xlog_fsync() doing nothing.

Oversight in commit a051e71e28a1.

Author: Sami Imseih <samims...@gmail.com>
Discussion: 
https://postgr.es/m/caa5rz0uxwg3xai4nvdbmj-zjqeeyg+rotuu+ebm2f6ckmnv...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/fdb69dd582427e4976897d544867e65a0e767002

Modified Files
--------------
src/test/regress/expected/stats.out | 1 +
src/test/regress/sql/stats.sql      | 1 +
2 files changed, 2 insertions(+)

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