fix(Toast): may lose forbid click when has multiple toasts (#5398)

src/toast/Toast.js

@@ -1,5 +1,6 @@
 import { createNamespace, isDef } from '../utils';
 import { PopupMixin } from '../mixins/popup';
+import { lockClick } from './lock-click';
 import Icon from '../icon';
 import Loading from '../loading';
 
@@ -65,8 +66,7 @@ export default createComponent({
 
       if (this.clickable !== clickable) {
         this.clickable = clickable;
-        const action = clickable ? 'add' : 'remove';
-        document.body.classList[action]('van-toast--unclickable');
+        lockClick(clickable);
       }
     },