[mod] one logger per engine - drop obsolete logger.getChild

Remove the no longer needed `logger = logger.getChild(...)` from engines.

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

searx/engines/solidtorrents.py

@@ -8,9 +8,6 @@
 
 from json import loads
 from urllib.parse import urlencode
-from searx import logger
-
-logger = logger.getChild('solidtor engine')
 
 about = {
     "website": 'https://www.solidtorrents.net/',