[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/springer.py

@@ -10,11 +10,8 @@ from datetime import datetime
 from json import loads
 from urllib.parse import urlencode
 
-from searx import logger
 from searx.exceptions import SearxEngineAPIException
 
-logger = logger.getChild('Springer Nature engine')
-
 about = {
     "website": 'https://www.springernature.com/',
     "wikidata_id": 'Q21096327',