Fix flag tests in src/test/modules/test_oat_hooks

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: f16180216d0a6dcefd76fef4121227b63df46681
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2022-07-13T10:58:56Z
Releases: 16.0
Fix flag tests in src/test/modules/test_oat_hooks

In what must have been a copy'n paste mistake, all the flag tests use
the same flag rather than a different flag each.  The bug is not
suprising, considering that it's dead code; add a minimal, testimonial
line to cover it.

This is all pretty inconsequential, because this is just example code,
but it had better be correct.

Discussion: https://postgr.es/m/20220712152059.fwli2majwgzdmh4r@alvherre.pgsql

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