[Dropdown]: Template for select-dropdown did not use classname-property from settings

[lubber-de]

Description

Testcase

In case a dropdown should be initiated out of a select -tag, the html was created via a template. This template however did not use classname settings from the settings.className property list, but had them hardcoded instead.

Screenshot

Given a very (very! 🤣 ) simple example
Two dropdowns, one from select, one from div:

<select class="ui dropdown"></select>
<div class="ui dropdown"></div>

Both initiated by

$('.ui.dropdown').dropdown({
        className : {
            menu: 'custom-hint-box menu',
            selection: 'custom-select'
        }
    });

In the DOM Inspector you will recognize the difference: The className setting is not applied to the dropdown made out of the select-tag

Unfixed

Fixed

Closes

Semantic-Org/Semantic-UI#3603

[y0hami]

LGTM

[ColinFrick]

LGTM