[c++] Fix a minor typo in logging statements

[johnkerl]

This was my own error a few PRs ago. :|

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.09%. Comparing base (ecf8f11) to head (96e69ce).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3099      +/-   ##
==========================================
+ Coverage   88.95%   89.09%   +0.13%     
==========================================
  Files          45       45              
  Lines        4293     4293              
==========================================
+ Hits         3819     3825       +6     
+ Misses        474      468       -6     

Flag	Coverage Δ
python	89.09% <ø> (+0.13%)	⬆️

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Components	Coverage Δ
python_api	89.09% <ø> (+0.13%)	⬆️
libtiledbsoma	∅ <ø> (∅)

[johnkerl]

Thanks @XanthosXanthopoulos ! :)