[mod] ahmia_filter: use on_result instead of post_search

see commit 6c9ae7911e9639bc46cd53af215734b4bdb61ba9

searx/plugins/ahmia_filter.py

@@ -20,14 +20,8 @@ def get_ahmia_blacklist():
     return ahmia_blacklist
 
 
-def not_blacklisted(result):
+def on_result(request, search, result):
     if not result.get('is_onion') or not result.get('parsed_url'):
         return True
     result_hash = md5(result['parsed_url'].hostname.encode()).hexdigest()
     return result_hash not in get_ahmia_blacklist()
-
-
-def post_search(request, search):
-    filtered_results = list(filter(not_blacklisted, search.result_container._merged_results))
-    search.result_container._merged_results = filtered_results
-    return True