[refactor] engines: migrate to SXNG_Response.html() (#6718)

searx/engines/niconico.py

@@ -3,7 +3,6 @@
 
 from urllib.parse import urlencode
 from datetime import datetime, timedelta
-from lxml import html
 
 from searx.utils import eval_xpath_getindex, eval_xpath_list, eval_xpath, extract_text
 
@@ -48,7 +47,7 @@ def request(query, params):
 
 def response(resp):
     results = []
-    dom = html.fromstring(resp.text)
+    dom = resp.html()
 
     for item in eval_xpath_list(dom, results_xpath):
         relative_url = eval_xpath_getindex(item, url_xpath, 0)