modify test case code

Signed-off-by: Nyu-shihao4 <yushihao4@huawei.com>

zh-cn/application-dev/reference/arkui-ts/ts-basic-components-web.md

@@ -1493,7 +1493,7 @@ onContextMenuShow(callback: (event?: { param: WebContextMenuParam, result: WebCo
           .onContextMenuShow((event) => {
             console.info("x coord = " + event.param.x());
             console.info("link url = " + event.param.getLinkUrl());
-            return false;
+            return true;
         })
       }
     }