fix duckduckgo.py (#1497)

### What problem does this PR solve?



### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

graph/component/duckduckgo.py

@@ -46,12 +46,12 @@ def _run(self, history, **kwargs):
         if not ans:
             return DuckDuckGo.be_output(self._param.no)
 
-        if self.channel == "text":
+        if self._param.channel == "text":
             with DDGS() as ddgs:
                 # {'title': '', 'href': '', 'body': ''}
                 duck_res = [{"content": '<a href="' + i["href"] + '">' + i["title"] + '</a>    ' + i["body"]} for i in
                             ddgs.text(ans, max_results=self._param.top_n)]
-        elif self.channel == "news":
+        elif self._param.channel == "news":
             with DDGS() as ddgs:
                 # {'date': '', 'title': '', 'body': '', 'url': '', 'image': '', 'source': ''}
                 duck_res = [{"content": '<a href="' + i["url"] + '">' + i["title"] + '</a>    ' + i["body"]} for i in