Add option to avoid duplicating the original class attribute

[jcam5826]

I upgraded my version of SumoSelect from version 3.0.3 to 3.4.8. There was a change made way back on 6/17/21 -- "feat: Pass origin class to generated element. Fixes [#294]". Which copies the class from the original select element to the ".CaptionCont.SelectBox" div element. This causes a problem on my legacy code which I have to remedy by undoing the duplicate classes:

const $select = $(".foo").SumoSelect();
$select.parent().find(".CaptionCont").removeClass($select.attr("class"));

It would be nice if an option existed that would prevent this duplication of classes.

I think the original issue #294, was simply requesting that an argument can be passed in to define what extra classes should be added to the generated element -- not necessarily forcing the parent's class to be duplicated. Maybe you can revisit the original request and if a class name is actually passed in, it would use the class name INSTEAD of duplicating the class name of the original select element. The duplication is unexpected and would be easy for someone who later selects elements based on only a class name, $(".foo)" to end up being surprised that they also picked up the ".CaptionCont" div -- granted a more specific selection of $("select.foo") would have been more prudent.

[Zenoo]

A way to solve this would be to cancel the class duplication and add an option to add classes to individual sumoselect components.

I don't have the bandwidth to handle it right now, but I will get around to it at some point.