Multiselect fix: disable options if selectionLimit reached by default value

[monim67]

Defect Fixes

• Multiselect doesn't disable options if selectionLimit reached by default value #7187

Why use ngDoCheck?

I could set the value of maxSelectionLimitReached in writeValue method. But using ChangeDetection
ensures the check-boxes are updated even if selectionLimit or options are updated later. I could not
use ngAfterViewChecked for that as the value of maxSelectionLimitReached is used in the template.

Why remove some code?

As the value of maxSelectionLimitReached is set though ChangeDetection, we don't need to set it
on checkbox click event anymore.

[cagataycivici]

doCheck will cause performance issues, should better to it at writeValue.

[monim67]

@cagataycivici the checking can be moved to ngOnChanges, is there any performance issues? My motive here is to keep the selectionLimit working even if I set/update selectionLimit or the options dynamically after the multi-select is initialized.