Remove unused style property

components/dropdown/dropdown.tsx

@@ -7,7 +7,6 @@ import warning from '../_util/warning';
 export interface DropDownProps {
   trigger?: ('click' | 'hover')[];
   overlay: React.ReactNode;
-  style?: React.CSSProperties;
   onVisibleChange?: (visible?: boolean) => void;
   visible?: boolean;
   disabled?: boolean;