Fix incorrect pg_stat_io output on 32-bit machines.

pg_stat_get_io() applied TimestampTzGetDatum twice to the
stat_reset_timestamp value.  On 64-bit builds that's harmless because
TimestampTzGetDatum is a no-op, but on 32-bit builds it results in
displaying garbage in the stats_reset column of the pg_stat_io view.

Bug dates to commit a9c70b46d which introduced pg_stat_io, so
back-patch to v16 where that came in.

Bertrand Drouvot

Discussion: 
https://postgr.es/m/ztrd+xcptz1zo...@ip-10-97-1-34.eu-west-3.compute.internal

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/dd20f950d4a37da3e71684f254fcdf4317b752b5

Modified Files
--------------
src/backend/utils/adt/pgstatfuncs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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