basebackup_to_shell: Add missing MarkGUCPrefixReserved()

Michael Paquier <michael@paquier.xyz>

Commit: 7307988abdff6c948d87e6d9dc9aaaa1f4c5283f
Author: Michael Paquier <michael@paquier.xyz>
Date: 2022-05-02T11:16:19Z
Releases: 15.0
basebackup_to_shell: Add missing MarkGUCPrefixReserved()

Oversight in c6306db24, as per a requirement from 88103567.  All the
other modules in the tree, be they in contrib/ or src/test/modules/,
already do that.

Author: Bharath Rupireddy
Discussion: https://postgr.es/m/CALj2ACUy7q_KwSMda+2SHPSWep32tNUM8cXGRS3=-Vfodo9OUg@mail.gmail.com

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