demo: demo bug of draggable modal (#41630)

该值默认false时，弹出窗口，鼠标不经过modal 的header（即绕过header，从左/右/下方进入modal的body）,鼠标左键在body区域按下=着不放并移动，modal也会跟着移动，有时需要选中复制body内文字时，modal一直跟着移动而造成无法选择文字

components/modal/demo/modal-render.tsx

@@ -5,7 +5,7 @@ import Draggable from 'react-draggable';
 
 const App: React.FC = () => {
   const [open, setOpen] = useState(false);
-  const [disabled, setDisabled] = useState(false);
+  const [disabled, setDisabled] = useState(true);
   const [bounds, setBounds] = useState({ left: 0, top: 0, bottom: 0, right: 0 });
   const draggleRef = useRef<HTMLDivElement>(null);