Update ui-config.json

ui-config.json

@@ -305,7 +305,7 @@
     "img2img/Prompt/visible": true,
     "img2img/Prompt/value": "请使用英文描述词！",
     "img2img/Negative prompt/visible": true,
-    "img2img/Negative prompt/value": "",
+    "img2img/Negative prompt/value": "请使用英文描述词！",
     "img2img/Styles/visible": true,
     "img2img/Styles/value": [
         "Default"