fix(dropdown): fix dropdown double import

Author: krzysiu-w

src/components/Dropdown/DropdownMenu/DropdownMenu.js

@@ -6,8 +6,6 @@ import DropdownMenuComponent from '../DropdownMenuComponent';
 import './DropdownMenu.css';
 import DropdownContext from '../DropdownContext';
 
-import DropdownMenuComponent from './DropdownMenuComponent';
-
 
 class DropdownMenu extends Component {
   render() {