Remove redundant call to pgstat_report_wal()
pgstat_report_stat() will be called before shutdown so an explicit call to
pgstat_report_wal() just before shutdown is redundant.
This likely was not redundant before
5891c7a8ed8, but now it clearly is.
Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/CAAKRu_aaq33UnG4TXq3S-OSXGWj1QGf0sU%2BECH4tNwGFNERkZA%40mail.gmail.com