[fix] enigne library genesis - remove 'enable_http: true'

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/settings.yml

@@ -801,7 +801,6 @@ engines:
 
   - name: library genesis
     engine: xpath
-    enable_http: true
     search_url: https://libgen.rs/search.php?req={query}
     url_xpath: //a[contains(@href,"bookfi.net/md5")]/@href
     title_xpath: //a[contains(@href,"book/")]/text()[1]