Use PG_DATA_CHECKSUM_OFF instead of hardcoded value

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: b3a37ffbc5b94c0214f1f3f1953e800654a1962f
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2026-04-06T20:11:53Z
Use PG_DATA_CHECKSUM_OFF instead of hardcoded value

For a long time, the online checksums patchset kept the "off" state as
literal zero without a label to be consistent with the previous coding
which only had a label for the "on" state.  Later, when an "off" label
was made not all uses in the code got the memo.  Fix by setting these
to PG_DATA_CHECKSUM_OFF.

While there, fix a duplicate word in a comment introduced by the same
commit.

Author: Aleksander Alekseev <aleksander@tigerdata.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/CAJ7c6TPRTnQFXXX1CRcYoTLXw2swtDH==uSz1MYoMKdLrKZHjA@mail.gmail.com

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