fix: 去掉默认

package.json

 {
   "name": "panda-xform",
-  "version": "5.0.1",
-  "description": "5.0.1 手写签名与富文本修复",
+  "version": "5.0.2",
+  "description": "5.0.2 手写签名",
   "keywords": [
     "panda-xform"
   ],

src/core/widgets/advanced/Signature/index.js

@@ -45,7 +45,7 @@ const Signature = (props) => {
   }
 
   useEffect(() => {
-    addons?.setValue(addons?.dataPath, presetValue || '9fa1dce1-2441-468d-b2d9-6129a6bd690f\\signature.png')
+    addons?.setValue(addons?.dataPath, presetValue || '')
   }, [presetValue])
 
   return (