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

searx/engines/fdroid.py

@@ -4,7 +4,6 @@ F-Droid (a repository of FOSS applications for Android)
 """
 
 from urllib.parse import urlencode
-from lxml import html
 from searx.utils import extract_text
 
 # about
@@ -37,7 +36,7 @@ def request(query, params):
 def response(resp):
     results = []
 
-    dom = html.fromstring(resp.text)
+    dom = resp.html()
 
     for app in dom.xpath('//a[@class="package-header"]'):
         app_url = app.xpath('./@href')[0]