Simplify onSelect callback parameter context

[qunabu]

Type is wrong as function takes only one parameter

[budnix]

I think the original line is correct. The first parameter points to this as function context not argument.

[qunabu]

I'll provide an not working example, it seems not be working with particular versions of TS and arrow fn callback

[qunabu]

Problem is when you put this code
https://github.com/handsontable/handsontable/blob/develop/handsontable/src/editors/dateEditor/dateEditor.js#L284
into typescript

To make this definition happy it should be

origOnSelect.call(this.$datePicker);

from original

origOnSelect();