[fix] mankier: fix paging

See https://github.com/searxng/searxng/pull/111#issuecomment-851641967

searx/settings.yml

@@ -775,7 +775,6 @@ engines:
 
   - name: mankier
     engine: json_engine
-    paging: true
     search_url: https://www.mankier.com/api/v2/mans/?q={query}
     results_query: results
     url_query: url