fix(core): pinning 1st column could caused the header to get misaligned

[ghiscoding]

• follows SlickGrid PR: fix: issue where pinning the first column caused the header to get misaligned 6pac/SlickGrid#1039

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.8%. Comparing base (0c2aca8) to head (42c94e8).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #1620    +/-   ##
=======================================
  Coverage    99.8%   99.8%            
=======================================
  Files         198     198            
  Lines       21796   21796            
  Branches     7304    7161   -143     
=======================================
  Hits        21735   21735            
  Misses         55      55            
  Partials        6       6            

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