Fix missing parentheses in config.hpp

[jslee02]

to fix #1837

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.56%. Comparing base (2b6abb5) to head (41e686f).
Report is 15 commits behind head on release-6.14.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-6.14    #1838   +/-   ##
=============================================
  Coverage         61.56%   61.56%           
=============================================
  Files               490      490           
  Lines             46021    46021           
=============================================
  Hits              28334    28334           
  Misses            17687    17687