Force hash joins to be enabled in the hash join regression tests.

Thomas Munro <tmunro@postgresql.org>

Commit: cba0fe024e35839688e3a3d256d1dcdf50baadaf
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2019-07-09T06:33:44Z
Releases: 13.0
Force hash joins to be enabled in the hash join regression tests.

Otherwise the regressplans.sh tests generate extremely slow nested
loop joins.  Back-patch to 11 where the hash join tests came in.

Reported-by: Michael Paquier
Discussion: https://postgr.es/m/20190708055256.GB2709%40paquier.xyz

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