oauth_validator: Remove racing GUC check

Follow-up to bca67e5a3. The test added there changed the value of
oauth_validator_libraries, waited for the postmaster to apply it, and
verified the change on an existing background connection. But there's no
guarantee that the SIGHUP will have arrived and completed its work on
existing backends by that time, so the final test flaked.

We only care about the postmaster's state here, since we're testing the
GUC's effects on newly forked backends, so remove the background check
entirely.

Per buildfarm member serinus.

Reported-by: Alexander Lakhin <[email protected]>
Discussion: https://postgr.es/m/a37a3cea-5bd8-4385-a1d4-bb89394c079c%40gmail.com
Backpatch-through: 18

Branch
------
REL_19_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/08f24a1152c264882209e5e555e1bfa14b11ad84

Modified Files
--------------
src/test/modules/oauth_validator/t/001_server.pl | 2 --
1 file changed, 2 deletions(-)

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