Minor cleanups in the BRIN code

Tomas Vondra <tomas.vondra@postgresql.org>

Commit: 28d03feac386c2c68ffaa47f30e6578591ef5c1b
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2023-07-02T08:21:17Z
Releases: 17.0
Minor cleanups in the BRIN code

BRIN bloom and minmax-multi opclasses were somewhat inconsistent when
dealing with bool variables, assigning to them Datum values etc. While
not a bug, it makes the code harder to understand, so fix that.

While at it, update an incorrect comment copied to bloom opclass from
minmax, talking about strategies not supported by bloom.

Reviewed-by: Heikki Linnakangas
Discussion: https://postgr.es/m/0e1f3350-c9cf-ab62-43a5-5dae314de89c%40enterprisedb.com

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