Inconsistency in the styling of the button of the DropDownList component

[petar-i-todorov]

Describe the bug
There is inconsistency in the styling of the button of the DropDownList component.

To Reproduce
Steps to reproduce the behavior:

1. Open a new project.
2. Drill-down to DropDownList.
3. Change the border-radius of the component part Select (button) from the template called "DROPDOWN LIST".
4. Change the background-color of the component part Select (button) from the template called "BUTTON".
5. Export the package.

Actual Results
The styles set through the DROPDOWN LIST template apply to all DropDownList's variants regardless of the rounded option set. The styles set through BUTTON, however, apply only to a DropDownList with rounded option of "medium".

Expected behavior
The styling is consistent in both templates - whether it applies styles to all component variants or only to a component variant with rounded "medium".

Reported through t.1664344.

[petar-i-todorov]

+1 from t.1667737.