test: remove redundant assertions for onKeyDown in ListBox tests

Author: hasegawa-101

packages/react-aria-components/test/ListBox.test.js

@@ -1870,11 +1870,9 @@ describe('ListBox', () => {
 
       fireEvent.keyDown(options[0], {key: 'Delete'});
       expect(onKeyDown).toHaveBeenCalledTimes(1);
-      expect(onKeyDown.mock.calls[0][0]).toHaveProperty('key', 'Delete');
 
       fireEvent.keyDown(options[1], {key: 'Backspace'});
       expect(onKeyDown).toHaveBeenCalledTimes(2);
-      expect(onKeyDown.mock.calls[1][0]).toHaveProperty('key', 'Backspace');
     });
   });
 });