Remove header noise from test_decoding test

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

Commit: 69360b34589bd6dbc7bc58dec718f938167f1071
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2020-03-31T19:43:14Z
Releases: 13.0
Remove header noise from test_decoding test

Use psql's expanded output to avoid a pointless header.

Kyotaro Horiguchi, after an idea of Michael Paquier

Discussion: https://postgr.es/m/20181120050744.GJ4400@paquier.xyz

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