ARROW-10229: [C++] Remove errant log line
ARROW-10229: [C++] Remove errant log line

noticed this on rereviewing the merged code.

Closes #8392 from emkornfield/remove_log

Authored-by: Micah Kornfield <dbc64ab8a675880673029ed6b2cb1d084dfef0bb@gmail.com>
Signed-off-by: Antoine Pitrou <9359a4d812173b65a3a0094cd86363e79731a3c2@python.org>

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