fix: tweak setupColumnSort() to fix exception when col no longer exists

[ghiscoding]

• this follows original SlickGrid PR 1016 to address a bug found in that repo

[stackblitz]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.8%. Comparing base (97da209) to head (9b968a4).

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1477     +/-   ##
========================================
+ Coverage    99.8%   99.8%   +0.1%     
========================================
  Files         199     199             
  Lines       21715   21717      +2     
  Branches     7255    7256      +1     
========================================
+ Hits        21651   21653      +2     
- Misses         58      64      +6     
+ Partials        6       0      -6     

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