style: remove unsed codes (#3382)

Author: 4geru

components/date-picker/props.ts

@@ -109,9 +109,3 @@ export const WeekPickerProps = {
   ...SinglePickerProps,
   placeholder: PropTypes.string,
 };
-
-// export interface DatePickerDecorator extends React.ClassicComponentClass<DatePickerProps> {
-//   RangePicker: React.ClassicComponentClass<RangePickerProps>;
-//   MonthPicker: React.ClassicComponentClass<MonthPickerProps>;
-//   WeekPicker: React.ClassicComponentClass<WeexPickerProps>;
-// }