fix(plugin): Grid Menu Clear Frozen Cols shouldn't change cols positions

[ghiscoding]

No description provided.

[codecov]

Codecov Report

Merging #721 (3857c79) into master (b4deea9) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #721   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          159       159           
  Lines        10691     10691           
  Branches      3786      3786           
=========================================
  Hits         10691     10691           

Impacted Files	Coverage Δ
.../angular-slickgrid/extensions/gridMenuExtension.ts	100.00% <100.00%> (ø)

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