fix(plugins): RowMoveManager shouldn't add cssClass when not usable

[ghiscoding]

• when usabilityOverride returns false on some rows, we shouldn't add the cssClass on the parent div

This issue came up in SlickGrid example while using an override function that returns false on every odd rows and it caused UI issue shown below

UI bug showing up

After fix

[codecov]

Codecov Report

Merging #1044 (8b35a9a) into master (c233a9c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1044   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          244       244           
  Lines        16560     16565    +5     
  Branches      5931      5936    +5     
=========================================
+ Hits         16560     16565    +5     

Impacted Files	Coverage Δ
...kages/common/src/extensions/slickRowMoveManager.ts	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes