Thomas Munro 63932a6d38 Fix wal_writer_flush_after initializer value.
Commit a73952b7956 (new in 16) required default values in guc_table.c
and C variable initializers to match.  This one only matched when
XLOG_BLCKSZ == 8kB.  Fix by using the same expression in both places
with a new DEFAULT_XXX macro, as done for other GUCs.

Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CA+hUKGLNmLV=VrT==5MqnbARgx2ifRSFtdd8ofdfrdSLL3yv5A@mail.gmail.com
2023-05-15 11:19:54 +12:00
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