fix: 修复字符集不匹配的情况提取web的问题

--bug=1048607 --user=刘瑞斌 【github#1577】有个网站导入web知识库报错 https://www.tapd.cn/57709429/s/1623295

Author: liuruibin

apps/common/util/fork.py

@@ -142,7 +142,7 @@ def get_beautiful_soup(response):
         if len(charset_list) > 0:
             charset = charset_list[0]
             if charset != encoding:
-                html_content = response.content.decode(charset)
+                html_content = response.content.decode(encoding)
                 return BeautifulSoup(html_content, "html.parser")
         return beautiful_soup