fix(pinning): recalculate frozen idx properly when column shown changes

[ghiscoding]

• when using ColumnPicker, GridMenu or hiding a column via HeaderMenu, it has to recalculate the frozenColumn index because SlickGrid doesn't take care of that and the previous fix that I implement sometimes become out of sync. This PR simplifies the frozenColumn index position, it will simply update it when the index is different, as simple as that.

[codecov]

Codecov Report

Merging #241 (e143542) into master (f64ed37) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #241    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          207       207            
  Lines        11931     11933     +2     
  Branches      3945      4099   +154     
==========================================
+ Hits         11931     11933     +2     

Impacted Files	Coverage Δ
...ges/common/src/extensions/columnPickerExtension.ts	100.00% <100.00%> (ø)
packages/common/src/extensions/extensionUtility.ts	100.00% <100.00%> (ø)
...ackages/common/src/extensions/gridMenuExtension.ts	100.00% <100.00%> (ø)
...kages/common/src/extensions/headerMenuExtension.ts	100.00% <100.00%> (ø)
packages/common/src/services/filter.service.ts	100.00% <0.00%> (ø)
...ing-component/src/slick-empty-warning.component.ts	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f64ed37...e143542. Read the comment docs.