Add missing MarkGUCPrefixReserved() in basebackup_to_shell module

[Bharath Rupireddy]

Hi,

It looks like commit c6306db24 (Add 'basebackup_to_shell' contrib
module.) missed to reserve basebackup_to_shell module's custom GUC
prefix via MarkGUCPrefixReserved("basebackup_to_shell");. This will
remove

Attaching a tiny patch to fix it.

Regards,
Bharath Rupireddy.

v1-0001-Add-missing-MarkGUCPrefixReserved-in-basebackup_t.patch
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