fix: Clear input should close panel

Author: zombieJ

src/Picker.tsx

@@ -371,6 +371,7 @@ function InnerPicker<DateType>(props: PickerProps<DateType>) {
         onClick={e => {
           e.stopPropagation();
           triggerChange(null);
+          triggerOpen(false, true);
         }}
         className={`${prefixCls}-clear`}
       >

tests/picker.spec.tsx

@@ -233,6 +233,7 @@ describe('Picker.Basic', () => {
 
         wrapper.clearValue();
         expect(onChange).toHaveBeenCalledWith(null, '');
+        expect(wrapper.isOpen()).toBeFalsy();
 
         wrapper.openPicker();
         expect(wrapper.find(selected).length).toBeFalsy();